@article{DE_1977_13_10_a21,
     author = {I. P. Martynov},
     title = {A differential equation with a moving singular line},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1879--1881},
     publisher = {mathdoc},
     volume = {13},
     number = {10},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_10_a21/}
}