%0 Journal Article %A Hengartner, Walter %A Szynal, Jan %T Univalent Harmonic Ring Mappings Vanishing on the Interior Boundary %J Canadian journal of mathematics %D 1992 %P 308-323 %V 44 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1992-021-x/ %R 10.4153/CJM-1992-021-x %F 10_4153_CJM_1992_021_x