@article{DE_1987_23_7_a12,
     author = {N. Yu. Kapustin},
     title = {The {Goursat} problem with boundary functions in the class $L_2$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1219--1231},
     publisher = {mathdoc},
     volume = {23},
     number = {7},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_7_a12/}
}