@article{10_4153_CJM_1973_041_9,
     author = {Aharonov, Dov and Kirwan, W. E.},
     title = {Covering {Theorems} for {Classes} of {Univalent} {Functions}},
     journal = {Canadian journal of mathematics},
     pages = {412--419},
     year = {1973},
     volume = {25},
     number = {2},
     doi = {10.4153/CJM-1973-041-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1973-041-9/}
}