@article{10_21136_CMJ_1992_128329,
     author = {Hollister, Herbert A.},
     title = {An infinite collection of absolutely convex subgroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {311--312},
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {1992},
     doi = {10.21136/CMJ.1992.128329},
     mrnumber = {1179501},
     zbl = {0778.06014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1992.128329/}
}