@article{DE_1977_13_12_a14,
     author = {Yu. M. Volin and G. M. Ostrovskii and A. V. Finkelstein},
     title = {Method of penalty functions and optimality conditions for the generalized solutions for an optimal control problem with partial derivatives},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2246--2255},
     publisher = {mathdoc},
     volume = {13},
     number = {12},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_12_a14/}
}