@article{DE_1973_9_2_a13,
     author = {L. M. Nevostruev},
     title = {The {Neumann} problem for the general {Lavrent'ev--Bicadze} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {320--324},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_2_a13/}
}