@article{DE_1991_27_5_a22,
     author = {N. N. Ryzhov},
     title = {Necessary optimality conditions for one-dimensional distributed systems with moving boundary},
     journal = {Differencialʹnye uravneni\^a},
     pages = {904--906},
     publisher = {mathdoc},
     volume = {27},
     number = {5},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_5_a22/}
}