@article{DE_1971_7_7_a2,
     author = {E. H. Al'brekht},
     title = {The coming together of quasilinear objects in the regular case},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1171--1178},
     publisher = {mathdoc},
     volume = {7},
     number = {7},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_7_a2/}
}