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- [2] A METHOD FOR COMPUTING SOME PERIOD DOUBLING BIFURCATIONS IN DUFFINGS EQUATION THEORETICAL AND APPLIED MECHANICS, VOL 38, 1989, 38 : 75 - 80
- [6] BEST DIFFERENCE EQUATION APPROXIMATION TO DUFFINGS EQUATION JOURNAL OF THE AUSTRALIAN MATHEMATICAL SOCIETY SERIES B-APPLIED MATHEMATICS, 1982, 23 (APR): : 349 - 356