@article{DE_1994_30_4_a11,
     author = {P. I. Plotnikov},
     title = {Passage to the limit with respect to viscosity in an equation with a variable direction of parabolicity},
     journal = {Differencialʹnye uravneni\^a},
     pages = {665--674},
     publisher = {mathdoc},
     volume = {30},
     number = {4},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_4_a11/}
}