@article{DAN_1961_137_6_a7,
     author = {M. B. Kapilevich},
     title = {Singular {Goursat} problems in a neighborhood of a singular characteristic at zero and at infinity},
     journal = {Doklady Akademii Nauk},
     pages = {1287--1290},
     publisher = {mathdoc},
     volume = {137},
     number = {6},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_137_6_a7/}
}