@article{M2AN_1974__8_2_129_0, author = {Brezzi, F.}, title = {On the existence, uniqueness and approximation of saddle-point problems arising from lagrangian multipliers}, journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique}, volume = {8}, year = {1974}, pages = {129-151}, mrnumber = {365287}, zbl = {0338.90047}, language = {en}, url = {http://dml.mathdoc.fr/item/M2AN_1974__8_2_129_0} }
Brezzi, F. On the existence, uniqueness and approximation of saddle-point problems arising from lagrangian multipliers. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Tome 8 (1974) pp. 129-151. http://gdmltest.u-ga.fr/item/M2AN_1974__8_2_129_0/
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