@article{M2AN_1977__11_4_341_0,
     author = {Fortin, Michel},
     title = {An analysis of the convergence of mixed finite element methods},
     journal = {RAIRO. Analyse num\'erique},
     pages = {341--354},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {11},
     number = {4},
     year = {1977},
     mrnumber = {464543},
     zbl = {0373.65055},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1977__11_4_341_0/}
}