@article{M2AN_1986__20_1_25_0,
     author = {Demirska, Ewa},
     title = {External approximation of bifurcation problems},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {25--46},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {20},
     number = {1},
     year = {1986},
     mrnumber = {844515},
     zbl = {0587.65041},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1986__20_1_25_0/}
}