000
00276nam a2200109 4500
008
160616s 000 0
245
_a
Elements of the theory of nonlinear oscillations
100
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Butenin, N.V.
500
_a
B7:54 K5
942
_c
BK
_2
BK8522
080
_a
534.01 BUT
999
_c
8522
_d
8522