[6] Mangasarian, O.L., Fromovitz, S., The Fritz John Necessary Optimal- ity Conditions in the Presence of Equality and Inequality Constraints, Journal of Mathematical,1967.10.1016/0022-247X(67)90163-1
[9] Negishi, T., Welfare Economics and Existence of an Equilibrium for a Competitive Economy, Metroeconomica, 12, 92-97, 1960.10.1111/j.1467-999X.1960.tb00275.x
[11] Preda, V., On Eficiency and Duality for Multi-objective Programs, Jour- nal of Mathematical Analysis and Applications, 166(8), 365-377, 1992.10.1016/0022-247X(92)90303-U
[12] Preda, V., Some optimality conditions for multiobjective programming problems with set functions, Revue Roumaine de Mathmatiques Pures et Appliques 39 (3), 233-248, 1994.