@article{10_4153_CJM_1992_021_x,
     author = {Hengartner, Walter and Szynal, Jan},
     title = {Univalent {Harmonic} {Ring} {Mappings} {Vanishing} on the {Interior} {Boundary}},
     journal = {Canadian journal of mathematics},
     pages = {308--323},
     year = {1992},
     volume = {44},
     number = {2},
     doi = {10.4153/CJM-1992-021-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1992-021-x/}
}