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Kaicheng Sheng and Anatoly Neishtadt. Bifurcations of phase portraits of pendulum with vibrating suspension point. Communications in Nonlinear Science and Numerical Simulation, 2017, 47, 71-80,
Anatoly Neishtadt , Kaicheng Sheng and Vladislav Sidorenko. Stability analysis of apsidal alignment in double averaged restricted elliptic three body problem. Celestial Mechanics and Dynamical Astronomy, 2021, 45,