@article{DE_1982_18_7_a3,
     author = {I. B. Badriev and M. M. Karchevskii},
     title = {Application of the duality method to the solution of nonlinear problems of filtration theory with a limit gradient},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1133--1144},
     publisher = {mathdoc},
     volume = {18},
     number = {7},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1982_18_7_a3/}
}