[1] A. Kufner B. Opic: The Dirichlet problem and weighted spaces I. Časopis pěst. mat. 108 (1983), 381-408. MR 0727537

[2] A. Kufner B. Opic: How to define reasonably weighted Sobolev spaces. Comment. Math. Univ. Carolin. 25 (3) (1984), 537-554. MR 0775568

[3] M. Vainberg: Variational Мethods for the Study of Nonlinear Operators. Holden-Day, San Francisco 1964. MR 0176364

[4] A. Kufner O. John S. Fučík: Function Spaces. Аcademia, Praha/Noordhoff, Leyden 1977. MR 0482102

[5] R. A. Adams: Sobolev spaces. Аcademic Press, New York-San Fгancisco-London 1975. MR 0450957 | Zbl 0314.46030

[6] J. L. Lions: Quelques méthodes de résolution des problèmes aux limites non linéaires. Dunod/Gauthier-Villars, Paris 1969. MR 0259693 | Zbl 0189.40603

[7] S. Fučík A. Kufner: Nonlinear Differential Equations. Elsevier Ѕcient. Publ. Comp., Аmsteгdam-Oxford-New York 1980. MR 0558764