1. V. N. Bolotin, ?Nonlinear plate and shell flutter,? Inzh. Sb.,28, Moscow (1960).
2. V. N. Bolotin, ?On critical velocities in nonlinear problems of aeroelasticity theory,? Sci. Repts. Higher Schools, Machine Construction and Instrumentation Series, No. 3 [in Russian], (1958).
3. G. I. Kopzon, ?Vibrations of a shallow wing-fuselage in a gas flow,? Dokl. Akad. Nauk SSSR,107, No. 3 (1956).
4. J. W. Miles, ?On the aerodynamic instability of thin panels,? J. Aeronaut. Sci.,23, No. 8 (1956).
5. P. F. Jordan, ?The physical nature of panel flutter,? Aero. Digest,72, No. 2 (1956).