000 00297nam a22000977a 4500
005 20250901165229.0
008 210224b ||||| |||| 00| 0 eng d
050 _aQA935 .B88
245 _aElements of the theory of nonlinear oscillations,
_cBUTENIN, N.V.
942 _2lcc
_hQA935 .B88 1965
999 _c682
_d682