Ceng, Lu-Chuan, Yeong-Cheng Liou, and Ching-Feng Wen. 2016. “Existence Theorems for Generalized Vector Equilibria With Variable Ordering Relation”. Tamkang Journal of Mathematics 47 (4):455-75. https://doi.org/10.5556/j.tkjm.47.2016.2163.