Pontryagin, L. S.
Ordinary differential equations - 1st ed. - London Pergamon Press 1962 - v, 298p. ill.
Ordinary differential equations
517.382 / PON/1962
Ordinary differential equations - 1st ed. - London Pergamon Press 1962 - v, 298p. ill.
Ordinary differential equations
517.382 / PON/1962