transformer-based resonant frequency cal

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求A. Bevilacqua, F. P. Pavan, C. Sandner, A. Gerosa, and A. Neviani,“Transformer-based dual-mode voltage controlled oscillators,” IEEE
Trans. Circuits Syst. II, Exp. Briefs, vol. 54, no. 4, pp. 293–297, 2007.
想学习一下two possible modes of oscillation with angular frequencies推导，谢谢！