@article{10_21136_CMJ_1980_101688,
     author = {Lembcke, J\"orn},
     title = {A set function without $\sigma$-additive extension having finitely additive extensions arbitrarily close to $\sigma$-additivity},
     journal = {Czechoslovak Mathematical Journal},
     pages = {376--381},
     publisher = {mathdoc},
     volume = {30},
     number = {3},
     year = {1980},
     doi = {10.21136/CMJ.1980.101688},
     mrnumber = {583618},
     zbl = {0478.28002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1980.101688/}
}