1. ARBOGAST T., A new formulation of mixed finite element methods for second order elliptic problems (to appear).1248.65119
2. ARNOLD D. N. and BREZZI F., Mixed and nonconforming finite element methods : implementation postprocessing and error estimates, RAIRO Model. Math. Anal Numér., 19 (1985), pp 7-32.1934438136870567.65078
3. BREZZI F., DOUGLAS Jr J. and DONATELLA MARINI L., Two families of mixed finite elements for second order elliptic problems, Numer Math., 47 (1985), pp 217-235.1330327996850599.65072
4. CHEN Z., On the relationship between mixed and Galerkin finite element methods, Ph. D. thesis, Purdue University, West Lafayette, Indiana, August (1991).
5. BREZZI F. and FORTIN M., Hybrid and Mixed Finite Element Methods, to appear.0788.73002