@article{SMJ2_2006_32_2-3_a4,
     author = {Wirths, K.-J.},
     title = {On the {Residuum} of {Concave} {Univalent} {Functions}},
     journal = {Serdica Mathematical Journal},
     pages = {209--214},
     publisher = {mathdoc},
     volume = {32},
     number = {2-3},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2006_32_2-3_a4/}
}