@article{DE_1989_25_8_a16,
     author = {M. I. Sumin},
     title = {Optimal control of objects that can be described by quasilinear elliptic equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1406--1416},
     publisher = {mathdoc},
     volume = {25},
     number = {8},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_8_a16/}
}