1. Friedrichs, K. O. and Stoker, J. J., Nonlinear boundary value problem of the buckled plate, Am. J. Math., 63 (1941), 839–888.
2. Friedrichs, K. O. and Stoker, J. J., Buckling of the circular plate beyond the critical thrust, ASME Trans., J. appl. Mech., 9 (1942), A7–A14.
3. Bodner, S. R., The postbuckling behaviour of a clamped circular plate, Q. appl. Math., 12 (1955), 397–401.
4. Yanowitch, M., Nonlinear buckling of circular elastic plates, Comm. pure Appl. Math., 9 (1956), 661–672.
5. Keller, H. B. and Reiss, E. L., Nonlinear bending and buckling of circular plates, Proc. 3rd Int. Cong. appl. Mech., Providence, 1958, 375–385.