Gregán, O.: Analysis of the possible impact of romanian and Hungarian Universities to economic development.
Stud Sci Res. Eco Ed. 37 18-34, 2023.

Gregán, O.: Correlation of innovativeness and impact on sustainability (SDG) at the universities of Europe.
In: No Question: Sustainability is Everyone's Business : V. BBS International Sustainability Student Conference Proceedings. Ed.: Szegedi Krisztina, Budapest Business School, Budapest, 144-165, 2022. ISBN: 9786156342386

Gregán, O.: Milyen kihívásokkal szembesül a vállalkozó egyetemen dolgozó intrapreneur? = What challenges do intrapreneurs working at entrepreneurial univerisities face?.
Economica. 13 (3-4), 57-66, 2022.