%0 Journal Article %A Z. Lipecki %T Tight extensions of group-valued quasi-measures %J Colloquium Mathematicum %D 1987 %P 213-219 %V 51 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-51-1-213-219/ %R 10.4064/cm-51-1-213-219 %G en %F 10_4064_cm_51_1_213_219