Integral Formulae Associated with the Euler-Lagrange Operators of Multiple Integral Problems in the Calculus of Variations. (Short Communication). Hanno Rund (1974) Aequationes mathematicae
Integral Formulae Associated with the Euler-Lagrange Operators of Multiple Integral Problems in the Calculus of Variations. Hanno Rund (1974) Aequationes mathematicae