A Solution of the 'Converse Canonical Problem' for Multiple Integrals in the Calculus of Variations (Short Communication) S.P. LIPSHITZ — 1971 Aequationes mathematicae
A canonical Formalism for the Non-Parametric Mulitple-Integral Problem of Lagrange in the Calculus of Variations. S.P. Lipshitz — 1970 Aequationes mathematicae
A Solution of the 'Converse Canonical Problem' for Multiple Integrals in the Calculus of Variations S.P. LIPSHITZ — 1971 Aequationes mathematicae
A Canonical Formalism for the Non-Parametric Multiple-Integral Problem for Lagrange in the Calculus of Variations. (Short Communication). S.P. Lipshitz — 1970 Aequationes mathematicae