@article{10_4064_sm_1_1_159_190,
     author = {Z. Birnbaum},
     title = {Beitr\"age zur {Theorie} der schlichten {Funktionen}},
     journal = {Studia Mathematica},
     pages = {159--190},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {1929},
     doi = {10.4064/sm-1-1-159-190},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-1-1-159-190/}
}