%0 Journal Article %A Wolfgang Sander %T Applications of certain R-families %J Fundamenta Mathematicae %D 1984 %P 77-84 %V 122 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-122-1-77-84/ %R 10.4064/fm-122-1-77-84 %G en %F 10_4064_fm_122_1_77_84