%0 Journal Article %A Frolík, Zdeněk %T A separation theorem and applications to Borel sets %J Czechoslovak Mathematical Journal %D 1970 %P 98-108 %V 20 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1970.100948/ %R 10.21136/CMJ.1970.100948 %G en %F 10_21136_CMJ_1970_100948