%0 Journal Article %A Bshouty, D. %A Hengartner, W. %A Schober, G. %T Estimates for the Koebe Constant and the Second Coefficient for Some Classes of Univalent Functions %J Canadian journal of mathematics %D 1980 %P 1311-1324 %V 32 %N 6 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1980-101-9/ %R 10.4153/CJM-1980-101-9 %F 10_4153_CJM_1980_101_9