@article{M2AN_1978__12_1_27_0,
     author = {Canuto, C.},
     title = {Eigenvalue approximations by mixed methods},
     journal = {RAIRO. Analyse num\'erique},
     pages = {27--50},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {12},
     number = {1},
     year = {1978},
     mrnumber = {488712},
     zbl = {0434.65032},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1978__12_1_27_0/}
}