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- [2] OSCILLATIONS FOR FORCED SECOND ORDER NONLINEAR DIFFERENTIAL EQUATIONS ATTI DELLA ACCADEMIA NAZIONALE DEI LINCEI RENDICONTI-CLASSE DI SCIENZE FISICHE-MATEMATICHE & NATURALI, 1974, 55 (1-2): : 25 - 30
- [6] OSCILLATIONS OF EVEN ORDER LINEAR IMPULSIVE DELAY DIFFERENTIAL EQUATIONS DIFFERENTIAL EQUATIONS & APPLICATIONS, 2010, 2 (02): : 163 - 176
- [10] ON RESONANT OSCILLATIONS OF A CONSERVATIVE FOURTH ORDER DIFFERENTIAL EQUATION TEXAS JOURNAL OF SCIENCE, 1967, 19 (04): : 402 - &