%0 Journal Article %A Owa, Shigeyoshi %T On certain classes of analytic functions %J Portugaliae mathematica %D 1981 %P 449-456 %V 40 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1981__40_4_115474/ %G en %F PORMA_1981__40_4_115474