@article{DE_1978_14_9_a14,
     author = {V. P. Pikulin},
     title = {The global solution of weakly nonlinear hyperbolic equations in a {Hilbert} space},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1659--1669},
     publisher = {mathdoc},
     volume = {14},
     number = {9},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_9_a14/}
}