GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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\begin{thebibliography}{DE01b}
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\bibitem[Aus60]{AUS}
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Louis Auslander.
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\newblock Bieberbach's theorem on space groups and discrete uniform subgroups
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  of lie groups.
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\newblock {\em Ann. of Math}, 71(3):579--590, 1960.
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\bibitem[Bro82]{BRO}
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Kenneth~S.\ Brown.
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\newblock {\em Cohomology of Groups}, volume~87 of {\em Grad. Texts in Math.}
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\newblock Springer-Verlag, New York, 1982.
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\bibitem[DE01a]{DE2}
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Karel Dekimpe and Bettina Eick.
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\newblock Computational aspects of group extensions and their application in
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  topology.
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\newblock {\em Submitted}, 2001.
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\bibitem[DE01b]{DE1}
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Karel Dekimpe and Bettina Eick.
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\newblock Computations with almost crystallographic groups.
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\newblock {\em Submitted}, 2001.
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\bibitem[Dek96]{KD}
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Karel Dekimpe.
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\newblock {\em Almost-Bieberbach Groups: Affine and Polynomial Structures},
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  volume 1639 of {\em Lecture Notes in Mathematics}.
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\newblock Springer-Verlag, Heidelberg, 1996.
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\bibitem[DM01]{DM}
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An~Descheemaeker and Wim Malfait.
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\newblock {$P$}-localization of relative groups.
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\newblock {\em Journal of Pure and Applied Algebra}, 159(1), 2001.
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\bibitem[Lee88]{LEE}
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Kyung~Bai Lee.
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\newblock There are only finitely many infra-nilmanifolds under each
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  nilmanifold.
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\newblock {\em Quart. J. Math. Oxford}, 39(2):61--66, 1988.
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\end{thebibliography}
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