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A note on the extremal surfaces in the calculus of variations. (English) Zbl 0008.36103
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[1] J. Hadamard, C. R.144 (1907), p. 1092. · JFM 49.0506.04
[2] L. Lichtenstein, Math. Annalen69 (1910), p. 514, has given a satisfactory proof in the elliptic case. However, his method is advanced and his functionF can not be analytic. · JFM 41.0441.01 · doi:10.1007/BF01457639
[3] W. F. Osgood, Annals of Math., Ser. 2,2 (1900-1901), p. 125, footnote. · JFM 31.0421.03
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