@article{DE_1972_8_1_a3,
     author = {V. P. Didenko},
     title = {The generalized solvability of boundary value problems for systems of differential equations of mixed type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {24--29},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_1_a3/}
}