@article{DE_1978_14_8_a6,
     author = {A. I. Tret'yak},
     title = {Asymptotic solution of certain optimal control problems with lags},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1414--1423},
     publisher = {mathdoc},
     volume = {14},
     number = {8},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_8_a6/}
}