@article{M2AN_1980__14_3_249_0,
     author = {Falk, R. S. and Osborn, J. E.},
     title = {Error estimates for mixed methods},
     journal = {RAIRO. Analyse num\'erique},
     pages = {249--277},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {14},
     number = {3},
     year = {1980},
     mrnumber = {592753},
     zbl = {0467.65062},
     language = {en},
     url = {http://archive.numdam.org/item/M2AN_1980__14_3_249_0/}
}