@article{10_1007_s10587_011_0039_5,
     author = {Donnelly, John},
     title = {A cancellative amenable ascending union of nonamenable semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {687--690},
     publisher = {mathdoc},
     volume = {61},
     number = {3},
     year = {2011},
     doi = {10.1007/s10587-011-0039-5},
     mrnumber = {2853083},
     zbl = {1249.43001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-011-0039-5/}
}