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Lectures on partial differential equations / I.G. Petrovsky ; translated from the Russian by A. Shenitzer.
- 515.353 P4979 1954
- Petrovskiĭ, I. G.
- Interscience Publishers,
- 1954
- New York :
-
Methods of mathematical physics / by R. Courant and D. Hilbert.
- 530.15 C858 1953
- Courant, Richard,
- Interscience Publishers,
- c1953-1962.
- New York :