1. Higher approximations in the theory of the elastic pendulum with internal resonance;Mettler;Zeitschrift für Angewandte Mathematik and Mechanik (ZAMM),1975
2. Autoparametric self-excitation of a pendulum-type elastic oscillator;Srinivasan;Journal of Sound and Vibration,1974
3. On the oscillations of a system of coupled oscillators with one third order resonance;Tsel'man;Prikladnaya Matematika i Mekhanika (PMM),1971
4. Oscillations of an elastic pendulum as an illustration of the oscillation of two parametrically coupled linear systems;Vitt;Zhurnal Tekhnicheskoi Fiziki,1933
5. Autoparametric interaction in structures;Barr,1972