%0 Journal Article %A Lembcke, Jörn %T A set function without $\sigma$-additive extension having finitely additive extensions arbitrarily close to $\sigma$-additivity %J Czechoslovak Mathematical Journal %D 1980 %P 376-381 %V 30 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1980.101688/ %R 10.21136/CMJ.1980.101688 %G en %F 10_21136_CMJ_1980_101688