Hybrid and mixed finite element methods / edited by S.N. Atluri, R.H. Gallagher and O.C. Zienkiewicz. - Atluri, S. N. (Satya N.); Gallagher, R. H. (Richard Hugo); Zienkiewicz, O. C. (Olgierd Cecil); Pian, Theodore H. H. (Wiley, 1983)