@article{10_21136_CMJ_1984_101971,
     author = {Glass, Andrew M. W.},
     title = {A directed $d$-group that is not a group of divisibility},
     journal = {Czechoslovak Mathematical Journal},
     pages = {475--476},
     publisher = {mathdoc},
     volume = {34},
     number = {3},
     year = {1984},
     doi = {10.21136/CMJ.1984.101971},
     mrnumber = {761428},
     zbl = {0561.06011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1984.101971/}
}