1. Hybrid and Mixed Finite Element Methods,1983
2. Mixed and irreducible formulations in finite element analysis;Zienkiewicz,1983
3. Generalized finite element methods and their relations to mixed problems;Babuška;SIAM J. Num. Anal.,1983
4. Complementary energy with penalty function in finite element analysis;Taylor,1979
5. Variational Methods in Elasticity and Plasticity;Washizu,1982