@article{DE_1977_13_7_a16,
     author = {B. G. Gabdulkhaev and S. M. Akhmetov},
     title = {Direct methods for solving equations of jet theory},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1299--1307},
     publisher = {mathdoc},
     volume = {13},
     number = {7},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_7_a16/}
}