%0 Journal Article %A J. Crenshaw %A R. Kirk %T Group valued, α-additive set functions %J Studia Mathematica %D 1979 %P 89-101 %V 65 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-65-2-89-101/ %R 10.4064/sm-65-2-89-101 %G en %F 10_4064_sm_65_2_89_101