@article{DAN_1981_260_4_a4,
     author = {I. A. Kipriyanov and L. A. Ivanov},
     title = {The {Euler{\textendash}Poisson{\textendash}Darboux} equation in a {Riemannian} space},
     journal = {Doklady Akademii Nauk},
     pages = {790--794},
     year = {1981},
     volume = {260},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_260_4_a4/}
}