Boundary value problems for a second-order hyperbolic equation in Hilbert space
1998 ◽
Vol 50
(11)
◽
pp. 1755-1764
◽
1999 ◽
Vol 51
(2)
◽
pp. 319-323
◽
2009 ◽
Vol 215
(6)
◽
pp. 2095-2102
◽
Keyword(s):