@article{DE_1976_12_12_a1,
     author = {V. I. Gurman and V. A. Dykhta},
     title = {Sufficient conditions for a strong minimum for degenerate optimal control problems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2129--2138},
     publisher = {mathdoc},
     volume = {12},
     number = {12},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_12_a1/}
}