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刘春根
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14.C. Liu, The stability of the periodic solutions of second order Hamiltonian systems. Chin. Ann. of Math. 21B:2(2000),225-232.
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15.Liu Chun-gen， Eigenvalue problem of Hamiltonian systems, Acta Sci. Natur. Uni. Nankai， 34(1), (2001)65-69.