1. L. R. Herrmann, A bending analysis of plates, Proceedings of the Conference on Matrix Methods in Structural Mechanics, Wright-Patterson AFB, Ohio, AFFDL-TR66-80, pp. 577–604, 1966
2. K. Hellan, Analysis of elastic plates in flexure by a simplified finite element method, Acta Polytechnica Scandinavica, Civil Engineering Series No. 46, Trondheim, 1967
3. W. Prager, Variational principles for elastic plates with relaxed continuity requirements, Int. J. Solids Structures 4, 837–844 (1968)
4. W. Visser, A refined mixed type plate bending element, AIAA J. 7, 1801–1803 (1969)
5. R. S. Dunham and K. S. Pister, A finite element application of the Hellinger-Resissner variational theorem, in Proceedings of the Conference on Matrix Methods in Structural Mechanics, Wright-Patterson AFB, Ohio, AFFDL-TR68-150, pp. 471–487, 1968