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Published online by Cambridge University Press: 04 August 2017
In a previous paper (Luo, 1986), we have improved the method by Katz (1982) and Fan et al (1983). We have also found some important features in a ring model with precession and nodding motion, i.e., all the higher periodical components contain the ones with n = 1,2,3. So we can call T1,T2, and T3 fundamental periods.