%0 Journal Article %A B. Węglorz %A A. Wojciechowska %T Summability of pure extensions of relational structures %J Colloquium Mathematicum %D 1968 %P 27-35 %V 19 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-19-1-27-35/ %R 10.4064/cm-19-1-27-35 %G en %F 10_4064_cm_19_1_27_35