@article{DE_1999_35_7_a7,
     author = {A. M. Denisov},
     title = {The problem of determining a nonlinear coefficient in a system of partial differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {926--934},
     year = {1999},
     volume = {35},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_7_a7/}
}