%0 Journal Article %A W. Janowski %T Extremal problems for a family of functions with positive real part and for some related families %J Annales Polonici Mathematici %D 1970 %P 159-177 %V 23 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-23-2-159-177/ %R 10.4064/ap-23-2-159-177 %G en %F 10_4064_ap_23_2_159_177