Lakatos, Á., Csontos, M., Csik, A.: Investigation of both thermal parameters and applications of closed-cell plastic thermal insulation foams with building energetic aspects.
J Therm Anal Calorim. [Epub] 1-26, 2024.

Szabó, Á., Lakatos, Á.: Thermal analysis of aerogels and their vacuum-formed forms, their potential uses, and their effects on the environment.
Case Stud Therm Eng. 56 1-13, 2024.

Lakatos, Á., Lucchi, E.: Thermal performances of Super Insulation Materials (SIMs): a comprehensive analysis of characteristics, heat transfer mechanisms, laboratory tests, and experimental comparisons.
Int. Commun. Heat Mass Transf. 152 1-12, 2024.

Eze, A., Lakatos, Á.: Applications of thermal insulation materials by aircraft.
J. Phys. Conf. Ser. 2628 1-7, 2023.

Lakatos, Á., Eze, A.: Comparison of thermal insulation performance of different materials used for aircrafts.
Lect. Notes Mech. Eng. 2023 346-356, 2023.

Lakatos, Á.: Thermal insulation capability of nanostructured insulations and their combination as hybrid insulation systems.
Case Stud. Therm. Eng. 41 1-16, 2023.

Kovács, Z., Csik, A., Lakatos, Á.: Thermal stability investigations of different aerogel insulation materials at elevated temperature.
Therm. Sci. Eng. Prog. 42 1-12, 2023.

Lakatos, Á.: Vapour diffusion calculations through graphite-enhanced polystyrene.
AIP Conf. Proc. 2918 (1), 1-8, 2023.

Lakatos, Á., Csik, A.: Multiscale thermal investigations of graphite doped polystyrene thermal insulation.
Polymers. 14 (8), 1-19, 2022.

Lakatos, Á.: Novel Thermal Insulation Materials for Buildings.
Energies. 15 (18), 1-4, 2022.

Lakatos, Á., Kovács, Z.: Thermal performance of nanostructured insulation materials: a comparison.
In: 15th International Vacuum Insulation Symposium : Brunel University London, UK 11-12 April, 2022, [s.n.], [s.l.], 1-4, 2022.

Lakatos, Á., Kovács, Z.: Comparison of thermal insulation performance of Vacuum Insulation Panels with EPS protection layers measured with different methods.
Energy Build. 236 1-12, 2021.

Lakatos, Á., Csik, A., Csarnovics, I.: Experimental verification of thermal properties of the aerogel blanket.
Case Studies in Thermal Engineering. 25 1-17, 2021.

Lakatos, Á., Szanyi, S.: Results on Thermal Annealing of Graphite Enhanced Polystyrene Insulations.
AIP Conf. Proc. 2429 1-5, 2021.

Vajó, B., Lakatos, Á.: Super Insulation Materials: an Application to Historical Buildings.
Buildings. 11 (11), 1-11, 2021.

Lakatos, Á., Csarnovics, I., Csik, A.: Systematic analysis of micro-fiber thermal insulations from thermal properties point of view.
Appl. Sci.-Basel. 11 (11), 1-18, 2021.

Lakatos, Á.: Diffusivities in Aerogel Estimated at Different Pressures.
AIP Conf Proc. 2275 1-5, 2020.

Lakatos, Á.: Exceeding the Applicability Limit of Aerogel Super Insulation Materials in Different Environmental Conditions.
Appl. Sci.-Basel. 10 1-14, 2020.

Lakatos, Á., Csarnovics, I.: Influence of thermal annealing on structural properties of silica aerogel super insulation material.
J. Therm. Anal. Calorim. 142 321-329, 2020.

Lakatos, Á.: Investigation of the thermal insulation performance of fibrous aerogel samples under various hygrothermal environment: laboratory tests completed with calculations and theory.
Energy Build. 214 1-9, 2020.

Kovács, Z., Szanyi, S., Budai, I., Lakatos, Á.: Laboratory tests of high performance thermal insulations.
In: Sustainability in Energy and Buildings. Eds.: Jain Lakhmi C., Capozzoli Alfonso, Howlett Robert J., Littlewood John, Springer, Singapore, 73-82, 2020, (Smart Innovation, Systems and Technologies, ISSN 2190-3018 ; 163) ISBN: 9789813298682

Lakatos, Á.: Thank you note to the Journal Founder, former Editor-in-Chief and introduction of the new Editor-In-Chief.
Int. Rev. Appl. Sci. Eng. 11 (2), 1, 2020.

Lakatos, Á., Trnik, A.: Thermal diffusion in fibrous aerogel blankets.
Energies. 13 (4), 1-9, 2020.

Lakatos, Á., Csik, A., Trnik, A., Budai, I.: Effects of the heat treatment in the properties of fibrous aerogel thermal insulation.
Energies. 12 1-12, 2019.

Černý, R., Lakatos, Á., Koči, V.: Heat and Mass Transfer in Building Energy Performance Assessment.
Multidisciplinary Digital Publishing Institute (MDPI AG), Basel, 122 p., 2019. ISBN: 9783039219261

Lakatos, Á., Kalmár, F., Csáky, I.: Material selection in order to minimize the heat loss of piping based on measurements and calculations.
In: AIP Conference Proceedings : ICCMSE 2019 : 15th International Conference of Computational Methods in Sciences and Engineering : volume 2186, [s.n.], [s.l.], 1-4, 2019.

Lakatos, Á.: Stability investigations of the thermal insulating performance of aerogel blanket.
Energy Build. 185 103-111, 2019.

Umberto, B., Lakatos, Á.: Thermal Bridges of Metal Fasteners for Aerogel-enhanced Blankets.
Energy Build. 185 307-315, 2019.

Lakatos, Á., Trnik, A.: Thermal characterization of fibrous aerogel blanket.
MATEC Web of Conferences. 282 (2019), Paper (01001,), 1-6, 2019.

Kalmár, F., Lakatos, Á.: Book of Abstracts of the 13th International enviBUILD 2018 Conference, 27-28 September 2018.
University of Debrecen, Debrecen, 37 p., 2018. ISBN: 9789634900269

Lakatos, Á.: Effect of the Placement of Aerogel Insulation in the Heat Transfer Properties.
J. Therm. Anal. Calorim. 133 (1), 321-327, 2018.

Lakatos, Á.: Laboratory Measurements of the Temperature Induced Changes in the Resistance of Wall Structures.
In: Proceedings of 127th The IRES International Conference Barcelona, Spain 11th-12th July 2018. Ed.: Suresh P, Institute of Research and Journals, Bhubaneswar, India, 28-31, 2018.

Lakatos, Á.: Laboratory Measurements of the Temperature Induced Changes in the Resistance of Wall Structures.
IJAMCE. 5 (5), 55-58, 2018.

Lakatos, Á., Deák, I., Berardi, U.: Thermal characterization of different graphite polystyrene.
In: Book of Abstracts of the 13th International enviBUILD 2018 Conference, 27-28 September 2018 / eds Ferenc Kalmár, Ákos Lakatos, University of Debrecen, Debrecen, 15, 2018. ISBN: 9789634900269

Lakatos, Á., Deák, I., Berardi, U.: Thermal characterization of different graphite polystyrene.
Int. Rev. Appl. Sci. Eng. 9 (2), 163-168, 2018.

Lakatos, Á.: Thermal Conductivity of Insulations Approached from a New Aspect.
J. Therm. Anal. Calorim. 133 (1), 329-335, 2018.

Lakatos, Á.: Thermophysics of materials.
Debreceni Egyetem, Debrecen, 55 p., 2018. ISBN: 9789634900122

Lakatos, Á.: Comprehensive Thermal Transmittance Investigations Carried out on Opaque Aerogel Insulation Blanket.
Mater. Struct. 50 (1), 1-21, 2017.

Szodrai, F., Lakatos, Á.: Effect of the air motion on the heat transport behaviour of wall structures.
Int. Rev. Appl. Sci. Eng. 8 (1), 67-73, 2017.

Szodrai, F., Lakatos, Á.: Effect of the Moisture in the Heat Storage Capacity of Building Structures.
Appl. Mech. Mater. 861 320-326, 2017.

Szodrai, F., Lakatos, Á.: Effect of wetting time in the sorption and in the thermal conductivity of the most commonly used structural materials.
Building Serv. Eng. Res. Technol. 38 (4), 475-489, 2017.

Lakatos, Á.: Investigation of the moisture induced degradation of the thermal properties of Aerogel blankets: measurements, calculations, simulations.
Energy Build. 139 506-516, 2017.

Lakatos, Á.: Thermophysical investigations of nanotechnological insulation materials.
AIP Conf. Proc. 1866 1-6, 2017.

Szodrai, F., Lakatos, Á., Kalmár, F.: Analysis of the change of the specific heat loss coefficient of buildings resulted by the variation of the geometry and the moisture load.
Energy. 115 (1), 820-829, 2016.

Lakatos, Á.: A Theoretical Approach to Estimate the Time Lag of Building Envelopes.
In: 16th International Multidisciplinary Scientific Geoconference SGEM 2016 : Book 6 : Nano, Bio and Green - Technologies for a Sustainable Future Conference Procedings Vol. III, STEF92 Technology Ltd., Sofia, 403-410, 2016. ISBN: 9786197105797

Lakatos, Á.: Examination of the Thermal Properties of Insulation Materials for Cool and Cold Stores.
In: Reference Module in Food Science. Ed.: Geoffrey Smithers, Elsevier, Amsterdam, 1-8, 2016. ISBN: 9780081005965

Lakatos, Á.: Heat transfer investigations carried out on brick based wall.
In: 8th Mid-European Clay Conference (MECC 2016) : Book of Abstracts. Kosice [Slovakia, 4-8 July 2016]. Ed.: Jana Valúchová, EQUILIBRIA, Kosice, 102, 2016. ISBN: 9788097228804

Csoknyai, T., Lakatos, Á., Soltész, I., Zöld, A.: Implementation of the EPBD in Hungary.

Lakatos, Á.: Initial State Sorption Measurements.
Appl. Mech. and Material. 824 (4), 589-597, 2016.

Lakatos, Á.: Investigation of Heat Transfer Decrement of Wall Structures comparison of Measurements And Calculations.
Wseas Trans. on Heat and Mass Transf. 11 (1), 1-7, 2016.

Szodrai, F., Lakatos, Á.: Különböző éghajlati viszonyoknak kitett épületek fűtési energiafelhasználásának csökkentése hőszigeteléssel.
Energiagazdálkodás. 57 (3-4), 26-29, 2016.

Lakatos, Á.: Moisture induced changes in the building physics parameters of insulation materials.
Scien. and Techn. for the Built Environm. 22 (3), 252-260, 2016.

Lakatos, Á.: Nanotechnológiás hőszigetelőanyagok vizsgálata tömör tégla falazaton.
Energiagazdálkodás. 57 (3-4), 21-25, 2016.

Lakatos, Á., Kao, J.: 2nd International Conference on Chemical, Biological, and Environmental Sciences (ICCBES-15).
[s. n.], [s. l.], 30 p., 2015. ISBN: 9789384468248

Lakatos, Á., Yingthawornsuk, T.: Conference Proceedings of 2015 International Conference on Computer, Control and Communication Technologies (CCCT'15), and International Conference on Aeronautical, Robotics and Manufacturing Engineering (ARME'2015).
[s.n.], [s.l.], 126 p., 2015. ISBN: 9789384422240

Rahman, A., Lakatos, Á.: International Conference on Biotechnology, Nanotechnology & Environmental Engineering (ICBNE-15) April 22-23, 2015 Bangkok (Thailand).
[s.n.], [s.l.], - p., 2015. ISBN: 9789384468217

Rahman, A., Lakatos, Á.: International Conference on Chemical, Food and Environment Engineering (ICCFEE-15) Jan. 11-12, 2015 Dubai (UAE).
[s.n.], [s.l.], - p., 2015. ISBN: 9789384468149

Rahman, A., Lakatos, Á.: International Conference on Waste Management, Ecology and Biological Sciences (WMEBS'15), International Conference on Artificial Intelligence, Electrical & Electronics Engineering (AIEE'15), and International Conference on Production, Automobiles and Mechanical Engineering (PAME'2015).
[s. n.], Kuala Lumpur, 150 p., 2015. ISBN: 9789384422189

Lakatos, Á.: Measurement of the heat transfer decrement of different wall structures.
In: Proceedings of the 11th International Conference on Heat and Mass Transfer. Szerk.: Nikos E Mastorakis, WSEAS Press, Budapest, 29-34, 2015. ISBN: 9781618043580

Lakatos, Á., Topcuoglu, B.: Proceedings of 2nd International Conference on Agriculture, Environment and Biological Sciences (ICAEBS-15) August 16-17, 2015 Bali (Indonesia).
International Academy, Research and Industry Association, Bali, - p., 2015. ISBN: 9789384468286

Szodrai, F., Lakatos, Á.: Simulations of the Changes of the Heating Energy Demand and Transmission Losses of Buildings in Central European Climate: Combination of Experiments and Simulations.
Int. Rev. Appl. Sci. Eng. 6 (2), 129-139, 2015.

Lakatos, Á., Csáky, I., Kalmár, F.: Thermal conductivity measurements with different methods: a procedure for the estimation of the retardation time.
Mater. Struct. 48 (5), 1343-1353, 2015.

Lakatos, Á.: Analyis of the type of the sorption isotherm curves of different materials.
In: IIE INT'L C. P. ICMLEME '2014. Ed.: Saji Baby, Parvinder S Sandhu, IIE, Dubai, 145-149, 2014. ISBN: 9789382242635

Lakatos, Á.: Analysis of the Type of the Sorption Isotherm Curves of Different Materials.
In: International Conference on Machine Learning, Electrical and Mechanical Engineering (ICMLEME'2014). Szerk.: Saji Baby; Parvinder S Sandhu, International Institute for Advanced Studies, Dubai, 111-114, 2014. ISBN: 9789382242635

Lakatos, Á.: Basics of heat transfer and fluid mechanics.
University of Debrecen, Debrecen, 126 p., 2014. ISBN: 9789634737988

Lakatos, Á.: Comparison of the Thermal Properties of Different Insulating Materials.
AMR. 899 381-386, 2014.

Szodrai, F., Lakatos, Á.: Építőanyagok nedvességfelvételének vizsgálata.
Magy. épülgép. 63 (1-2), 33-36, 2014.

Lakatos, Á., Kalmár, F.: Examination of the change of the overall heat transfer coefficients of building structures in function of water content.
Building Serv. Eng. Res. Technol. 35 (5), 507-515, 2014.

Lakatos, Á.: Hőtechnikai mérések oktatási jegyzet: Gépészmérnök BSc, Létesítménymérnök MSc szakos hallgatók számára.
[Debreceni Egyetem, Műszaki Kar, Épületgépészeti és Létesítménymérnöki Tanszék], Debrecen, 20 p., 2014.

Lakatos, Á.: Investigation of the effect of moisture in the time lag of building walls with different insulating materials.
EEMJ. 13 (11), 2853-2858, 2014.

Lakatos, Á.: Measurements of Thermal Properties of Different Building Materials.
AMR. 1016 (1), 733-737, 2014.

Szodrai, F., Lakatos, Á.: Measurements of the thermal conductivities of some commonly used insulating materials after wetting.
Environ. Eng. Manag. J. 13 (11), 2881-2886, 2014.

Verbai, Z., Lakatos, Á., Kalmár, F.: Prediction of energy demand for heating of residential buildings using variable degree day.
Energy. 76 780-787, 2014.

Lakatos, Á.: Results of Sorption Measurements Carried Out On Building Materials.
In: Book of Abstracts, European Conference on Surface Science. Ed.: Sefik Suzer, [s.n.], [s.l.], , 2014.

Lakatos, Á., Kalmár, F.: Analysis of water sorption and thermal conductivity of expanded polystyrene insulation materials.
Building Serv. Eng. Res. Technol. 34 (4), 407-416, 2013.

Kovács, T., Lakatos, Á.: A nedvesség hatása az épületszerkezetek hőtároló képességére.
Magyar épületgépészet. 62 (9), 4-6, 2013.

Lakatos, Á., Szodrai, F.: Comparison of the Thermal Properties of Different Insulating Materials.
In: 8th International Conference Buildings and Environment 2013. International Conference Proceedings. Ed.: Katarína Minarovicová, Jozef Hraska, STU, Bratislava, 448-453, 2013. ISBN: 9788022740708

Kalmár, F., Csomós, G., Lakatos, Á.: Focus on renewable energy (energy policy): Editorial.
Int. Rev. Appl. Sci. Eng. 4 (1), 95-95, 2013.

Lakatos, Á.: Funkcionális rendszerek és működésük.
Terc Kft., Budapest, 204 p., 2013. ISBN: 9789639968660

Lakatos, Á.: Hőtan, áramlástan.
Terc Kft., Budapest, 204 p., 2013. ISBN: 9789639968684

Lakatos, Á., Varga, S., Kalmár, F.: Influence of the moisture in the thermal conductivity of Expanded Polystyrene insulators.
In: Contributions to building physics. Ed.: A. Mahdavi, B. Martens, RSA, Bécs, 653-656, 2013. ISBN: 9783854373216

Lakatos, Á., Kalmár, F.: Investigation of thickness and density dependence of thermal conductivity of expanded polystyrene insulation materials.
Mater. Struct. 46 (7), 1101-1105, 2013.

Beke, D., Langer, G., Molnár, G., Erdélyi, G., Katona, G., Lakatos, Á., Vad, K.: Kinetic pathways of diffusion and solid-state reactions in nanostructured thin films.
Philos. Mag. 93 (16), 1960-1970, 2013.

Lakatos, Á., Szigeti, S., Kalmár, F.: Measurement of the water uptaking capability of a thermal insulating paint.
In: Proceedings of DENZERO International Conference : Sustainable energy by optimal integration of renewable energy sources: 10-11 october 2013, Debrecen / publ. University of Debrecen, University of Debrecen, Debrecen, 77-84, 2013. ISBN: 9789634736240

Lakatos, Á., Szigeti, S., Kalmár, F.: Measurement of the water uptaking capability of a thermal insulating paint.
Int. Rev. Appl. Sci. Eng. 4 (2), 157-161, 2013.

Lakatos, Á.: Mérések a Debreceni Egyetem Műszaki Kar Hőtechnikai Laboratóriumában.
Magyar épületgépészet. 62 (4), 11-13, 2013.

Kalmár, F., Csomós, G., Lakatos, Á.: Sustainable Energy By Optimal Integration Of Renewable Energy Sources. 1st Denzero International Conference - Review.
Int. Rev. Appl. Sci. Eng. 4 (2), 185, 2013.

Lakatos, Á.: Hő- és Áramlástan II: példatár : Gépészmérnök BSc szakos hallgatók számára [gyakorlati jegyzet].
[Debreceni Egyetem, Műszaki Kar, Épületgépészeti és Létesítménymérnöki Tanszék], Debrecen, 15 p., 2012.

Lakatos, Á., Erdélyi, G., Makovec, A., Langer, G., Csik, A., Vad, K., Beke, D.: Investigation of diffusional intermixing in Si/Co/Ta system by Secondary Neutral Mass Spectrometry.
Vacuum. 86 (6), 724-728, 2012.

Lakatos, Á.: Investigation of water sorption properties of different insulating materials.
In: Proceedings in Advanced Research in Scientific Areas / Ing. Michal Mokrys, Ing. Anton Lieskovsky, Ph.D, EDIS - Publishing Institution of the University of Zilina, Zilina, 1827-1831, 2012. ISBN: 1831

Lakatos, Á., Tiba, Z., Kiss, J., Boros, N., Talamon, A., Kalmár, F.: Proceedings of 18th Building Services, Mechanical and Building Industry days, International Conference.
Debreceni Egyetem, Debrecen, 307 p., 2012. ISBN: 9789634735915

Lakatos, Á.: Thermodynamics and Fluid mechanics I: Practice Questions for Mechanical engineering BSc students [seminar note].
[University of Debrecen, Faculty of Engineering, Department of Building Services and Building Engineering], Debrecen, 15 p., 2012.

Lakatos, Á.: Thermodynamics and Fluid mechanics II: Practice Questions for Mechanical engineering BSc students [seminar note].
[University of Debrecen, Faculty of Engineering, Department of Building Services and Building Engineering], Debrecen, 16 p., 2012.

Kalmár, F., Lakatos, Á.: Az építőiparban alkalmazott polisztirol alapanyagú hőszigetelő anyagok szorpció-hővezetési tényező kapcsolatának vizsgálata: K+F+I szakmai beszámoló.
HUNÉP Zrt., Debrecen, 129 p., 2011.

Lakatos, Á.: Geotermikus kutak acélcsöveinek degradációs mechanizmusainak bemutatása és vizsgálati lehetőségei javaslattételekkel.
[S.n.], Debrecen, 43 p., 2011.

Beke, D., Lakatos, Á., Erdélyi, G., Makovec, A., Langer, G., Daróczi, L., Vad, K., Csik, A.: Investigation of grain boundary diffusion in thin films by SNMS technique.
Defect Diffus. Forum. 312-315 1208-1215, 2011.

Lakatos, Á.: Method for the determination of sorption isotherms of materials demonstrated through soil samples.
Int. Rev. Appl. Sci. Eng. 2 (2), 117-121, 2011.

Lakatos, Á.: Sorption isotherm measurements carried out on soil samples.
In: XVII. Épületgépészeti, Gépészeti és Építőipari Szakmai Napok : szakkiállítás és Nemzetközi Tudományos Konferencia 2011. október 13-14. [elektronikus dokumentum]. Szerk.: Kalmár Ferenc, Balla Tibor ; [közread. a] Debreceni Egyetem Műszaki Kar, Debreceni Egyetem Műszaki Kar, Debrecen, 1-9, 2011. ISBN: 9789634734642

Lakatos, Á., Erdélyi, G., Langer, G., Daróczi, L., Vad, K., Csik, A., Dudás, A., Beke, D.: Investigation of diffusional intermixing in Si/Co/Ta system by Secondary Neutral Mass Spectrometry.
In: 13th Joint Vacuum Conference Book of Abstracts /ed. Andrej Vincze, [S.n.], Poprad, 158-158, 2010. ISBN: 9788073999698

Lakatos, Á., Erdélyi, G., Langer, G., Daróczi, L., Vad, K., Csik, A., Dudás, A., Beke, D.: Investigations of diffusion kinetics in Si/Ta/Cu/W and Si/Co/Ta systems by secondary neutral mass spectrometry.
Vacuum. 84 (7), 953-957, 2010.

Lakatos, Á., Erdélyi, G., Langer, G., Daróczi, L., Vad, K., Csik, A., Dudás, A., Beke, D.: Investigations of diffusion kinetics in Si/Ta/Cu/W and Si/Co/Ta systems by secondary neutral mass spectrometry.
Vacuum. 85 (4), 493-497, 2010.

Lakatos, Á., Langer, G., Csik, A., Cserháti, C., Kis-Varga, M., Daróczi, L., Katona, G., Erdélyi, Z., Erdélyi, G., Vad, K., Beke, D.: Nanoscale investigation of shift of individual interfaces in temperature induced processes of Ni-Si by secondary neutral mass.
Appl. Phys. Lett. 97 233103-1 - 233103-3, 2010.

Cserháti, C., Erdélyi, Z., Katona, G., Csik, A., Lakatos, Á., Langer, G., Kis-Varga, M., Daróczi, L., Erdélyi, G., Vad, K., Zizak, I., Dudzik, E., Feyerherm, R., Beke, D.: Anomalous growth kinetics of the Ni2Si reaction layer in a-Si/Ni system.
In: International Workshop "Diffusion and Solid State Reactions on Nanoscale". Ed.: Csik Attila, University of Debrecen, Department of Solid State Physics, Debrecen, 23, 2009.

Lakatos, Á., Csik, A., Langer, G., Erdélyi, G., Katona, G., Daróczi, L., Vad, K., Tóth, J., Beke, D.: Investigation of failure mechanisms at Ta and TaO diffusion barries by secondary neutral mass spectrometry.
Vacuum. 84 (1), 130-133, 2009.

Lakatos, Á., Erdélyi, G., Langer, G., Daróczi, L., Vad, K., Csik, A., Beke, D.: Secondary Neutral Mass Spectrometry investigations of diffusion effects in Si/Ta/Cu/W and Si/Co/Ta systems.
In: Book of abstracts of 4-th Symposium on Vacuum based Science and Technology in conjunction with 8-th Annual Meeting of German Vacuum Society. Konferencia helye, ideje: Gdansk, Lengyelország, 2009.09.20-2009.09.23.. Ed.: Witold Gulbinski, Lenygelország, Kolobrzeg, 44, 2009.

Lakatos, Á., Csik, A., Langer, G., Erdélyi, G., Katona, G., Daróczi, L., Vad, K., Tóth, J., Beke, D.: Investigations of failure mechanisms at Ta and TaO diffusion barriers by SNMS.
Atomki Annual Report. 16 (1), 50, 2008.