1. Dynamic stability of a pendulum at the oscillating to subweight point;Kapitsa;ZhETF,1951
2. Pendulum with a vibrating subweight;Kapitsa;Phys.-Uspekhi,1951
3. High power electronics;Kapitsa;Phys.-Uspekhi,1962
4. Asymptotic Methods in the Theory of Nonlinear Oscillations;Bogoliubov,1961
5. Mechanics;Landau,1960