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- [45] INTERNAL RESONANCE IN A NONLINEAR MULTI-DEGREE-OF-FREEDOM VIBRATORY SYSTEM (WHEN ITS NATURAL FREQUENCIES SATISFY THE CONDITION p1 plus p2 equals p3 or 2p1 plus p2 equals p3). Nippon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 1986, 52 (474): : 639 - 647