por Nemytskii, Viktor Vladimirovich, 1900- [autor] | Stepanov, Viacheslav Vasil'evich, 1889-1950 [autor].
por Nemytskii, Viktor Vladimirovich, 1900- [autor] | Stepanov, Viacheslav Viktorovich, 1889-1950 [autor] | Nemytskii, Viktor Vladimirovich, 1900-. Kachestvennaia teoriia differentsial nykh uravenii.