@article{M2AN_1991__25_2_169_0,
     author = {Angermann, Lutz},
     title = {Numerical solution of second-order elliptic equations on plane domains},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {169--191},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {25},
     number = {2},
     year = {1991},
     mrnumber = {1097143},
     zbl = {0717.65082},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1991__25_2_169_0/}
}