Finding efficient points for linear multiple objective programs. - Joseph G. Ecker; Issoufou Kouada (Math. Program., 1975)

Finding all efficient extreme points for multiple objective linear programs. - Joseph G. Ecker; Issoufou Kouada (Math. Program., 1978)

Upper-semi-continuity and cone-concavity of multi-valued vector functions in a duality theory for vector optimization. - Issoufou Kouada (Math. Methods Oper. Res., 1997)