@article{DAN_1990_314_6_a16,
     author = {Kh. G. Umarov},
     title = {The {Cauchy} problem in a {Banach} space for an analogue of a},
     journal = {Doklady Akademii Nauk},
     pages = {1352--1356},
     publisher = {mathdoc},
     volume = {314},
     number = {6},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_314_6_a16/}
}