@article{MZ_1982__180_173174,
     author = {Stephan Ruscheweyh and K.-J. Wirths},
     title = {On {Extreme} {Bloch} {Functions} with {Prescribed} {Critical} {Points.}},
     journal = {Mathematische Zeitschrift},
     pages = {91--106},
     year = {1982},
     volume = {180},
     zbl = {0482.30023},
     url = {http://geodesic.mathdoc.fr/item/MZ_1982__180_173174/}
}