@article{DAN_1990_314_6_a0,
     author = {R. Kh. Amirov},
     title = {Uniqueness of the solution of the {Cauchy} problem for an},
     journal = {Doklady Akademii Nauk},
     pages = {1289--1290},
     publisher = {mathdoc},
     volume = {314},
     number = {6},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_314_6_a0/}
}