@article{CMH_1982__57_139897,
     author = {Ch. Pommerenke and S.E. Warschawski},
     title = {On the quantitative boundary behavior of conformal maps.},
     journal = {Commentarii mathematici Helvetici},
     pages = {107--129},
     publisher = {mathdoc},
     volume = {57},
     year = {1982},
     zbl = {0491.30007},
     url = {http://geodesic.mathdoc.fr/item/CMH_1982__57_139897/}
}