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@article{MM2_1988__60_2_155294, author = {Eng Tjioe Tan}, title = {Remarks on free {Bieberbach} {Groups.}}, journal = {Manuscripta mathematica}, pages = {477--486}, publisher = {mathdoc}, volume = {60}, number = {2}, year = {1988}, zbl = {0654.20059}, url = {http://geodesic.mathdoc.fr/item/MM2_1988__60_2_155294/} }
Eng Tjioe Tan. Remarks on free Bieberbach Groups.. Manuscripta mathematica, Tome 60 (1988) no. 2, pp. 477-486. http://geodesic.mathdoc.fr/item/MM2_1988__60_2_155294/