@article{DE_1982_18_1_a4,
     author = {T. Sh. Kal'menov},
     title = {Regular extensions of the semiminimal {Lavrent'ev{\textendash}Bitsadze} operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {37--58},
     year = {1982},
     volume = {18},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1982_18_1_a4/}
}