1. Brezzi, F.: On the existence, uniqueness and approximation of saddle-point problems arising from Lagrangian multiplier. RAIRO, S�rie Analyse Num�rique, R.2. p. 129?151 (1974)
2. Brezzi, F., Raviart, P.A.: Mixed Finite Element Methods for the 4th order elliptic equations. Topics in Numerical Analysis III, (J.J.H. Miller, ed.) New York: Academic Press, (in press)
3. Hood, P., Taylor, G.: Navier-Stokes equation using mixed interpolation, Finite Element Method in flow problems, Oden Editor, UAH Press (1974)
4. Huyakorn, P.S., Taylor, C., Lee, R.L., Gresho, P.M.: A comparison of various mixed-interpolation Finite elements for the Navier Stokes equation. Computer and Fluids,6, 25?35 (1978)
5. Lecture notes in Computer Science;Jamet,1974