@article{M2AN_1984__18_2_161_0,
     author = {Regi\'nska, Teresa},
     title = {External approximation of eigenvalue problems in {Banach} spaces},
     journal = {RAIRO. Analyse num\'erique},
     pages = {161--174},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {18},
     number = {2},
     year = {1984},
     mrnumber = {743883},
     zbl = {0554.65043},
     language = {en},
     url = {http://archive.numdam.org/item/M2AN_1984__18_2_161_0/}
}