@article{DAN_1967_177_5_a6,
     author = {Yu. V. Sidorov},
     title = {The {Cauchy} problem for an equation of the first order with respect to time, with variable coefficients},
     journal = {Doklady Akademii Nauk},
     pages = {1012--1014},
     year = {1967},
     volume = {177},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_177_5_a6/}
}