@article{DE_1968_4_1_a1,
     author = {V. I. Evsin},
     title = {Some boundary value problems for {Darboux's} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {16--33},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_1_a1/}
}