1. Berge, C., Espaces Topologiques, Fonctions Multivoques, Dunod, Paris, France, 1959.
2. Robinson, S. M., Generalized Equations and Their Solutions, Part 1: Basic Theory, Mathematical Programming Study, Vol. 10, pp. 128–141, 1979.
3. Aubin, J. P., and Cellina, A., Differential Inclusions: Set-Valued Maps and Viability Theory, Springer Verlag, Berlin, Germany, 1984.
4. Klein, K., and Thompson, A. C., Theory of Correspondences, John Wiley, New York, NY, 1984.
5. Aubin, J. P., and Frankowska, H., Set-Valued Analysis, Birkhäuser, Basel, Switzerland, 1990.