1. Adams, R.A.(1980): Sobolev spaces, Academic Press, New York.
2. Alt, H.W. and Luckhaus, S.(1983): Quasilinear Elliptic — Parabolic Differential Equations. Math. Z. 183, pp. 311–341.
3. Antontsev, S.N. and Díaz, J.I.(1989): New results on localization of solutions of nonlinear el-liptic and parabolic equations obtained by energy methods, Soviet Math. Dokl. 38, pp 535–539.
4. Arino, O., Gautier, S. and Penot, J.P.(1984): A Fixed Point Theorem for sequentially contin-uous mappings with applications to ordinary differential equations Funkcialaj Ekvacioj, 27, pp. 273–279.
5. Aubin, T.(1982): Nonlinear Analysis on Manifolds. Monge-Ampere Equations. Springer-Verlag.