@article{DE_1976_12_2_a16,
     author = {Ya. V. Radyno and N. J. Yurchuk},
     title = {The {Cauchy} problem for certain abstract hyperbolic equations of evenorder},
     journal = {Differencialʹnye uravneni\^a},
     pages = {331--342},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_2_a16/}
}