@article{CMH_1981__56_139876,
     author = {W.K. Hayman and J.-M.G. Wu},
     title = {Level sets of univalent functions.},
     journal = {Commentarii mathematici Helvetici},
     pages = {366--403},
     publisher = {mathdoc},
     volume = {56},
     year = {1981},
     zbl = {0473.30012},
     url = {http://geodesic.mathdoc.fr/item/CMH_1981__56_139876/}
}