... S. Karamardian and S. Schaible, Seven kinds of monotone maps, Journal of Optimization Theory and Applications 66 (1990), no. 1, 37–46.[6] H.Z.LuoandZ.K.Xu,On characterizations of prequasi-invex ... functions, Journal of OptimizationTheory and Applications 120 (2004), no. 2, 429–439.[7] S. R. Mohan and S. K. Neogy, On invex sets and preinvex functions, Journal of MathematicalAnalysis and Applications ... Yang, and K. L. Teo, Characterizations and applications of prequasi-invex func-tions, Journal of Optimization Theory and Applications 110 (2001), no. 3, 645–668.[13], Generalized invexity and...