@article{MZ_1976__149_172382,
     author = {Rolf Rannacher},
     title = {Zur {L...-Konvergenz} linearer finiter {Elemente} beim {Dirichlet-Problem.}},
     journal = {Mathematische Zeitschrift},
     pages = {69--78},
     publisher = {mathdoc},
     volume = {149},
     year = {1976},
     zbl = {0321.65055},
     url = {http://geodesic.mathdoc.fr/item/MZ_1976__149_172382/}
}