@article{AFM_1985_10_1_a15,
     author = {Peter Duren and Glenn Schober},
     title = {Nonvanishing univalent functions {III}},
     journal = {Annales Fennici Mathematici},
     pages = {139--147},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {1985},
     doi = {10.5186/aasfm.1985.1016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1985.1016/}
}