%0 Journal Article %A Ashok Maitra %T Coanalytic sets that are not Blackwell spaces %J Fundamenta Mathematicae %D 1970 %P 251-254 %V 67 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-67-2-251-254/ %R 10.4064/fm-67-2-251-254 %G en %F 10_4064_fm_67_2_251_254