@article{DE_1965_1_10_a2,
     author = {E. H. Al'brekht},
     title = {On the existence of the {Ljapunov} optimal function and of a continuous optimal control for a certain problem on analytic construction of regulators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1301--1311},
     publisher = {mathdoc},
     volume = {1},
     number = {10},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_10_a2/}
}