Geodesic
On boundary value problems for a second-order differential equation of hyperbolic type in a Hilbert space
Doklady Akademii Nauk, Tome 221 (1975) no. 4, pp. 763-766 
L. I. Vainerman; M. L. Gorbachuk. On boundary value problems for a second-order differential equation of hyperbolic type in a Hilbert space. Doklady Akademii Nauk, Tome 221 (1975) no. 4, pp. 763-766. http://geodesic.mathdoc.fr/item/DAN_1975_221_4_a1/
@article{DAN_1975_221_4_a1,
     author = {L. I. Vainerman and M. L. Gorbachuk},
     title = {On boundary value problems for a second-order differential equation of hyperbolic type in a {Hilbert} space},
     journal = {Doklady Akademii Nauk},
     pages = {763--766},
     year = {1975},
     volume = {221},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_221_4_a1/}
}
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