1. and , Studies in Non-linear Programming, Stanford Univ. Press, California, 1958.
2. and , Résolution Numérique de Problèmes aux limites par des Méthodes de Lagrangien Augmenté, Dunod, Paris, 1983.
3. and , ‘Finite element approximation of the Navier-Stokes equations’, in Lecture Notes in Mathematics, Springer Verlag, Berlin, 1979.
4. Experiments with several elements for viscous incompressible flows