INVESTIGATION OF THE EQUATION OF SINGLE-DEGREE-OF-FREEDOM VIBRATION WITH SPRING NONLINEARITY BY THE METHOD OF INTEGRAL INEQUALITIESGUTOWSKI R.1981; BULL. ACAD. POL. SCI., SER. SCI. TECH.; ISSN 0001-4125; POL; DA. 1981 PUBL. 1982; VOL. 29; NO 5-6; PP. 251-258; ABS. RUS; BIBL. 1 REF.Article

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