1. The finite element method with Lagrangian multipliers;Babuška;Numer. Math.,1973
2. On the existence, uniqueness and approximation of saddle-point problems arising from lagrangian multipliers;Brezzi;ESAIM Math. Model. Numer. Anal.,1974
3. Mixed and Hybrid Finite Element Methods;Brezzi,1991
4. Finite Element Methods for Navier-Stokes Equations –Theory and Algorithms;Girault,1986
5. Theory and Practice of Finite Elements;Ern,2004