@article{DAN_1970_190_1_a14,
     author = {Yu. I. Cherskii},
     title = {A normally solvable equation of smooth transition},
     journal = {Doklady Akademii Nauk},
     pages = {57--60},
     year = {1970},
     volume = {190},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_190_1_a14/}
}