Team, Support. 2016. “Ekeland’s Variational Principle and Its Applications to Equilibrium Problems: A. Hosseinpour, A. Farajzadeh, S. Plubtieng”. Thai Journal of Mathematics 14 (3):543-51. https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/617.