1. A. V. Bitsadze, A. A. Samarskii, On some simple generalizations of linear elliptic boundary value problems Dokl. Akad. Nauk SSSR 185(1969), 739--740, English transl. in Soviet Math. Dokl. 10(1969).
2. On pseudomonotone elliptic operators with functional dependence on unbounded domains
3. J. L. Lions, Quelques méthodes de résolution des problèmes aux limites non linéaires, Dunod, Gauthier-Villars, Paris, 1969.
4. L. Simon, Existence results for strongly nonlinear functional-elliptic problems, in: Differential equations and its applications (Budapest, 1991), Coll. Math. Soc. J. Bolyai, Vol. 62, North-Holland, Amsterdam, 1991, pp. 271--287.
5. Chapter 6 Application of Monotone Type Operators to Parabolic and Functional Parabolic PDE's