The algorithms are described in the papers

- Willem de Graaf and Andrea Pavan, Constructing arithmetic subgroups of unipotent groups,
*Journal of Algebra*,**322**3950--3970 (2009). - Paolo Faccin, Willem de Graaf and Wilhelm Plesken, Computing generators of the unit group of an
integral abelian group ring,
*Journal of Algebra*,**373**, 441--452 (2013).

The file is: At the top of the filee the provided functions are explained, and illustrated by an example.