@article{DE_1979_15_10_a11,
     author = {G. V. Sherbina},
     title = {On the question of a priori estimates for solutions of second-order equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1840--1847},
     publisher = {mathdoc},
     volume = {15},
     number = {10},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_10_a11/}
}