%0 Journal Article %A ALZER, HORST %T ON A CONVEXITY THEOREM OF RUSKAI AND WERNER AND RELATED RESULTS %J Glasgow mathematical journal %D 2005 %P 425-438 %V 47 %N 3 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089505002685/ %R 10.1017/S0017089505002685 %F 10_1017_S0017089505002685