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2. J.-L. Lions, Quelques Méthodes de Résolution des Problèmes aux Limites non Linéaires (Dunod, Paris, 1969).
3. F. M. Morse and G. Feshbach, Methods of Theoretical Physics (McGraw-Hill, New York, 1953), Vol. 2.
4. N. V. Krylov, Lectures on Elliptic and Parabolic Equations in Holder Spaces (Nauchn. Kniga, Novosibirsk, 1998) [in Russian].
5. N. V. Krylov, Nonlinear Elliptic and Parabolic Equations of Second Order (Nauka, Moscow, 1985) [in Russian].