On a periodicity problem in the calculus of variations
Doklady Akademii Nauk, Tome 160 (1965) no. 2, pp. 287-289.

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     author = {A. I. Fet},
     title = {On a periodicity problem in the calculus of variations},
     journal = {Doklady Akademii Nauk},
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     publisher = {mathdoc},
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     number = {2},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_160_2_a9/}
}
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A. I. Fet. On a periodicity problem in the calculus of variations. Doklady Akademii Nauk, Tome 160 (1965) no. 2, pp. 287-289. http://geodesic.mathdoc.fr/item/DAN_1965_160_2_a9/