Capata, A., Kassay, G.,
Burján, -.:
On Weak Multifunction Equilibrium Problems.
In: Variational Analysis and Generalized Differentiation in Optimization and Control. In: Springer Optimization and Its Applications, Vol 47. / Regina S. Burachik; Jen-Chih Yao, Springer, New York, NY, New York, 133-148, 2010. ISBN: 9781441904362