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Chrastina, Jan On the equivalence of variational problems. I. (English) Zbl 0764.49008 J. Differ. Equations 98, No. 1, 76-90 (1992). MSC: 49J40 PDFBibTeX XMLCite \textit{J. Chrastina}, J. Differ. Equations 98, No. 1, 76--90 (1992; Zbl 0764.49008) Full Text: DOI