@article{GDZPPN002064359, title = {Level sets of univalent functions.}, journal = {Commentarii mathematici Helvetici}, volume = {56}, year = {1981}, pages = {366-403}, zbl = {0473.30012}, url = {http://dml.mathdoc.fr/item/GDZPPN002064359} }
Hayman, W.K.; Wu, J.-M.G. Level sets of univalent functions.. Commentarii mathematici Helvetici, Tome 56 (1981) pp. 366-403. http://gdmltest.u-ga.fr/item/GDZPPN002064359/