1. 王高雄, 周之铭, 朱思铭, 等. 常微分方程[M]. 第3版. 北京: 高等教育出版社, 2006.
2. Mawhin, J. (1987) Recent Results on Periodic Solutions of the Forced Pendulum Equation. Rendiconti dell’Istituto di Matematica dell’Università di Trieste, 19, 119-129.
3. Mawhin, J. (1988) The Forced Pendulum: A Paradigm for Nonlinear Analysis and Dynamical Systems. Expositiones Mathematicae, 6, 271-287.
4. Analytic solution to the pendulum equation for a given initial conditions
5. Magnus, W. and Winkler S. (1966) Hill’s Equations. John Wiley, New York.