Bugaev, N.V. Obshchie usloviya integriruemosti v konechnom vide ellipticheskogo differentsiala. S.Pb. 1892./Bugaev, N.V. General conditions of integrability in the final form of an elliptical differential. St. Petersburg. - landofmagazines.com

TransliterationBugaev, N.V. Obshchie usloviya integriruemosti v konechnom vide ellipticheskogo differentsiala. S.Pb. 1892.

In EnglishBugaev, N.V. General conditions of integrability in the final form of an elliptical differential. St. Petersburg.

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