@article{DAN_1980_251_4_a5,
     author = {V. V. Lychagin},
     title = {On the singularities of solutions of differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {794--799},
     publisher = {mathdoc},
     volume = {251},
     number = {4},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_251_4_a5/}
}