@article{DE_1984_20_12_a11,
     author = {S. G. Krein and N. P. Polichka},
     title = {A priori estimates for solutions of a problem with displacement for the {Lavrent'ev--Bitsadze} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2112--2120},
     publisher = {mathdoc},
     volume = {20},
     number = {12},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_12_a11/}
}