%0 Journal Article %A B. S. Spahn %T On topologies generating the Effros Borel structure and on the Effros measurability of the boundary operation %J Colloquium Mathematicum %D 1980 %P 251-260 %V 43 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-43-2-251-260/ %R 10.4064/cm-43-2-251-260 %G en %F 10_4064_cm_43_2_251_260