1. Kapitza, P. L. Dynamic stability of the pendulum with vibrating suspension point (in Russian). Sov. Phys JETP 21, 588 (1951).
2. Kapitza, P. L. Collected papers of P. L. Kapitza ume II (Pergamon, Oxford, 1938–1964 (1965).
3. Stephenson, A. On an induced stability. Phil. Mag. 15, 233 (1908).
4. Landa, P. S. Nonlinear Oscillations and Waves in Dynamical Systems. Mathematics and Its Applications (Springer, 1996).
5. Landau, D. L. & Lifshitz, E. M. Mechanics (Pergamon, Oxford, 1976).