@article{DE_1987_23_12_a22,
     author = {K. B. Mansimov},
     title = {Some necessary conditions for optimality for a class of systems with distributed parameters},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2164--2167},
     publisher = {mathdoc},
     volume = {23},
     number = {12},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_12_a22/}
}