New classes of generalized invex monotonicity. Xu, B., Zhu, D.L. (2006) Journal of Inequalities and Applications [electronic only]
New system of general nonconvex variational inequalities. Noor, Muhammad Aslam, Noor, Khalida Inayat (2010) Applied Mathematics E-Notes [electronic only]
Numerical solution of some classes of complementarity and variational problems via dualization Jochen W. Schmidt (1990) Banach Center Publications