@article{DAN_1971_196_1_a4,
     author = {V. P. Grigor'ev},
     title = {On solvability of mixed problems for a class of quasi-linear differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {24--27},
     publisher = {mathdoc},
     volume = {196},
     number = {1},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_196_1_a4/}
}