On properties of geodesic η -preinvex functions. Ahmad, I.; Iqbal, Akhlad; Ali, Shahid — 2009 Advances in Operations Research
Second order converse duality for nonlinear programming. Ahmad, I.; Agarwal, Ravi P. — 2010 The Journal of Nonlinear Sciences and its Applications
Optimality and duality in nonsmooth multiobjective optimization involving V-type I invex functions. Agarwal, Ravi P.; Ahmad, I.; Husain, Z.; Jayswal, A. — 2010 Journal of Inequalities and Applications [electronic only]