%0 Journal Article %A Jerrold Siegel %T Čech extensions and localization of homotopy functors %J Fundamenta Mathematicae %D 1980 %P 159-170 %V 108 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-108-3-159-170/ %R 10.4064/fm-108-3-159-170 %G en %F 10_4064_fm_108_3_159_170