Petrovskiĭ, I. G. (1967). Partial differential equations. Iliffe Books.
Lua i Stíl Chicago (17ú heag.)Petrovskiĭ, I. G. Partial Differential Equations. London: Iliffe Books, 1967.
Lua MLA (8ú heag.)Petrovskiĭ, I. G. Partial Differential Equations. Iliffe Books, 1967.
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