Criteria for generalized invex monotonicities

Ruiz-Garzón, 2003, Generalized invex monotonicity, European Journal of Operational Research, 144, 501, 10.1016/S0377-2217(01)00393-9 Yang, 2003, Generalized invexity and generalized invariant monotonicity, Journal of Optimization Theory and Applications, 117, 607, 10.1023/A:1023953823177 Mohan, 1995, On invex sets and preinvex functions, Journal of Mathematical Analysis and Applications, 189, 901, 10.1006/jmaa.1995.1057