@article{CMH_1966__41_139320,
     author = {Peter Lappan},
     title = {Some results on functions holomorphic in the unit disk.},
     journal = {Commentarii mathematici Helvetici},
     pages = {183--186},
     year = {1966},
     volume = {41},
     zbl = {0154.07401},
     url = {http://geodesic.mathdoc.fr/item/CMH_1966__41_139320/}
}