@article{ELMA_1985__40_141354,
     author = {Albert Pfluger},
     title = {Varianten des {Schwarzschen} {Lemma.}},
     journal = {Elemente der Mathematik},
     pages = {46--47},
     year = {1985},
     volume = {40},
     zbl = {0566.30021},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1985__40_141354/}
}