Elsgolc, L. E.
Calculus of variations - 1st ed. - London Pergamon press 1962 - 178 p. ill.
Variational calculus
517.4 / ELS/1962
Calculus of variations - 1st ed. - London Pergamon press 1962 - 178 p. ill.
Variational calculus
517.4 / ELS/1962