%0 Journal Article %A Robert Blair %T Filter characterizations of z-, C*-, and C-embeddings %J Fundamenta Mathematicae %D 1975 %P 285-300 %V 90 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-90-3-285-300/ %R 10.4064/fm-90-3-285-300 %G en %F 10_4064_fm_90_3_285_300