@article{DE_1972_8_11_a0,
     author = {B. P. Bogoslovskii},
     title = {The nonstationary singularities of a certain class of nonlinear equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1919--1926},
     publisher = {mathdoc},
     volume = {8},
     number = {11},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_11_a0/}
}