@article{DE_1989_25_9_a14,
     author = {V. V. Kornienko},
     title = {Smoothness of solutions of irregular equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1572--1577},
     publisher = {mathdoc},
     volume = {25},
     number = {9},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_9_a14/}
}