@article{DAN_1986_288_4_a8,
     author = {Yu. G. Kondrat'ev and T. V. Tsikalenko},
     title = {Infinite-dimensional hyperbolic equations corresponding to},
     journal = {Doklady Akademii Nauk},
     pages = {814--817},
     publisher = {mathdoc},
     volume = {288},
     number = {4},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_288_4_a8/}
}