000
00252nam a2200109 4500
008
160616s 000 0
245
_a
Boundary value problems
100
_a
Gakhov, F.D
500
_a
B334:1 K61
942
_c
BK
_2
BK3853
080
_a
517.927 GAK
999
_c
3853
_d
3853