1. Rockafellar, R. T., Convex Analysis, Princeton University Press, Princeton, New Jersey, 1970.
2. Giannessi, F., Theorems of the Alternative, Quadratic Programs, and Complementarity Problems, Variational Inequalities and Complementarity Problems, Edited by R. W. Cottle, F. Giannessi, and J. L. Lions, Wiley, New York, New York, pp. 151–186, 1980.