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3. F. D. Stacey, Physics of the Éarth, Wiley (1969).
4. N. N. Yanenko, The Method of Fractional Steps in the Solution of Multidimensional Problems of Mathematical Physics [in Russian], Nauka, Novosibirsk (1967).
5. A. A. Samarskii, Theory of Difference Schemes [in Russian], Nauka Moscow (1977).