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- [7] PERIODIC-SOLUTION FOR CERTAIN NONLINEAR 3RD ORDER DIFFERENTIAL-EQUATION INDIAN JOURNAL OF PURE & APPLIED MATHEMATICS, 1990, 21 (03): : 203 - 210
- [10] EXISTENCE OF PERIODIC-SOLUTIONS FOR A CERTAIN NONLINEAR 3RD ORDER DIFFERENTIAL-EQUATION ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK, 1977, 57 (05): : T241 - T243