Title: Error Estimates for Mixed Methods Authors: Richard S. Falk and John E. Osborn Source: R.A.I.R.O. Analyse num\'erique/Numerical Analysis vol. 14, no.3, 1980, 249-277 Status: Published Abstract: This paper presents abstract error estimates for mixed methods for the approximate solution of elliptic boundary value problems. These estimates are then applied to obtain quasi-optimal error estimates in the usual Sobolev norms for four examples; three mixed methods for the biharmonic problem and a mixed method for second order elliptic problems. Keywords: Subj. Class. URL: http://www.math.rutgers.edu/~falk/papers/falk-osborn.pdf