1. 1. BREZZI F. and RAVIART P. A., Mixed Finite Element Methods for Mh Order Elliptic Equations (to appear).0434.65085
2. 2. CIARLET P. G. and RAVIART P. A., Interpolation Theory Over Curved Elements, with Applications to Finite Element Methods, Computer Meth. Appl. Mech. Engrg., 1, 1972, pp. 217-249.3758010261.65079
3. 3. CIARLET P. G. and RAVIART P. A., A Mixed Finite Element Method for the Biharmonic Equation in Mathematical Aspects of Finite Elements in Partial Differential Equations, C. DEBOOR, Ed., Proc. Symp. Math. Res. Center, Univ. Wisconsin, April 1-3, 1974, Academic Press, New York - San Francisco- London, 1974, pp. 125-145.6579770337.65058
4. 4. FREHSE J. and RANNACHER R., Eine L 1 $L^1$ -Fehlerabschätzung für diskrete Grundlösungen in der Methode der finiten Elemente, Bonner Math. Schriften, 89, 1976, pp. 92-114.4713700359.65093
5. 5. MDCHLIN S. G., The Problem of the Minimum of a Quadratic Functional, Holden-Day, Inc., San Francisco - London - Amsterdam, 1965.1711960121.32801