Two-dimensional problems of the calculus of variations in nonparametric form
Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 2 (1953), pp. 201-233.

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     author = {A. G. Sigalov},
     title = {Two-dimensional problems of the calculus of variations in nonparametric form},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {201--233},
     publisher = {mathdoc},
     volume = {2},
     year = {1953},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1953_2_a3/}
}
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A. G. Sigalov. Two-dimensional problems of the calculus of variations in nonparametric form. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 2 (1953), pp. 201-233. http://geodesic.mathdoc.fr/item/MMO_1953_2_a3/