%0 Journal Article %A de Groot, J. %A Herrlich, H. %A Strecker, G. E. %A Wattel, E. %T Compactness as an operator %J Compositio Mathematica %D 1969 %P 349-375 %V 21 %N 4 %I Wolters-Noordhoff Publishing %U http://archive.numdam.org/item/CM_1969__21_4_349_0/ %G en %F CM_1969__21_4_349_0