@article{DE_1988_24_3_a6,
     author = {M. D. Mardanov},
     title = {Sufficient conditions for optimality in problems with delays},
     journal = {Differencialʹnye uravneni\^a},
     pages = {408--416},
     publisher = {mathdoc},
     volume = {24},
     number = {3},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1988_24_3_a6/}
}