Does anybody know if there exists a list of the four dimensional Bieberbach groups presented by generators and relations on the web?. I know there exists the book Crystallographic Groups of Four-Dimensional Space by Brown, Bulow and Neubuser, but I do not have it at the moment.
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The page of low dimensional Bieberbach groups may prove useful. It does not give relations, but that holds for the book you mentioned as well.