no. R2
On the existence, uniqueness and approximation of saddle-point problems arising from lagrangian multipliers
Revue française d'automatique, informatique, recherche opérationnelle. Analyse numérique, Tome 8 (1974) no. R2, pp. 129-151. 
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     author = {Brezzi, F.},
     title = {On the existence, uniqueness and approximation of saddle-point problems arising from lagrangian multipliers},
     journal = {Revue fran\c{c}aise d'automatique, informatique, recherche op\'erationnelle. Analyse num\'erique},
     pages = {129--151},
     publisher = {Dunod},
     address = {Paris},
     volume = {8},
     number = {R2},
     year = {1974},
     mrnumber = {365287},
     zbl = {0338.90047},
     language = {en},
     url = {http://archive.numdam.org/item/M2AN_1974__8_2_129_0/}
}
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Brezzi, F. On the existence, uniqueness and approximation of saddle-point problems arising from lagrangian multipliers. Revue française d'automatique, informatique, recherche opérationnelle. Analyse numérique, Tome 8 (1974) no. R2, pp. 129-151. http://archive.numdam.org/item/M2AN_1974__8_2_129_0/

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