On the question of necessary and sufficient conditions for a minimum in variational problems
Differencialʹnye uravneniâ, Tome 4 (1968) no. 2, pp. 290-297.

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     author = {G. S. Rozenberg},
     title = {On the question of necessary and sufficient conditions for a minimum in variational problems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {290--297},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_2_a11/}
}
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G. S. Rozenberg. On the question of necessary and sufficient conditions for a minimum in variational problems. Differencialʹnye uravneniâ, Tome 4 (1968) no. 2, pp. 290-297. http://geodesic.mathdoc.fr/item/DE_1968_4_2_a11/