[Bar09]   Barakat, M.,
 The homalg package -- GAP4
 (2007-2009)
(http://homalg.math.rwth-aachen.de/index.php/core-packages/homalg-package).
[BGKLH08]   Barakat, M., Görtzen, S., Kirschmer, M. and Lange-Hegermann, M.,
 GAP Package RingsForHomalg
 (2007-2008)
(http://homalg.math.rwth-aachen.de/index.php/core-packages/ringsforhomalg).
[BR08]   Barakat, M. and Robertz, D.,
 homalg -- A Meta-Package for Homological
      Algebra,
 J. Algebra Appl.,
 7 (3)
 (2008),
 299--317
(arXiv:math.AC/0701146).
[Gör08a]   Görtzen, S.,
 GAP Package GaussForHomalg
 (2007-2008)
(http://wwwb.math.rwth-aachen.de/goertzen/GaussForHomalg).
[Gör08b]   Görtzen, S.,
 GAP Package SCO
 (2007-2008)
(http://wwwb.math.rwth-aachen.de/goertzen/SCO).
[ht09]   homalg team, T.,
 The homalg project
 (2003-2009)
(http://homalg.math.rwth-aachen.de/).
[LN08]   Lübeck, F. and Neunhöffer, M.,
 GAP Package GAPDoc
 (2007-2008)
(http://www.math.rwth-aachen.de/~Frank.Luebeck/GAPDoc).
[MP99] Moerdijk, I. and Pronk, D. A., Simplicial cohomology of orbifolds, Indag. Math. (N.S.), 10 (2) (1999), 269--293.
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