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Nester, James M. Invariant derivation of the Euler-Langrange equation. (English) Zbl 0658.53071 J. Phys. A 21, No. 21, L1013-L1017 (1988). Reviewer: C.S.Sharma MSC: 53C80 70H03 PDFBibTeX XMLCite \textit{J. M. Nester}, J. Phys. A, Math. Gen. 21, No. 21, L1013--L1017 (1988; Zbl 0658.53071) Full Text: DOI