@manual{ GAP4,
  title =            {{GAP  \texttt{\symbol{45}}\texttt{\symbol{45}} Groups,
                      Algorithms, and Programming, Version 4.8}},
  organization =     {The GAP\texttt{\symbol{126}}Group},
  year =             {2006},
  note =             {\href                      {http://www.gap-system.org}
                      {\texttt{http://www.gap\texttt{\symbol{45}}system.org}}},
  key =              {GAP},
  keywords =         {groups; *; gap; manual}
}
@inproceedings{ BREACA,
  author =           {Barakat, M. and Robertz, D.},
  booktitle =        {{Proceedings of the X meeting on computational algebra
                      and its applications ({EACA 2006}), Sevilla (Spain)}},
  title =            {$homalg$:  First  steps  to  an  abstract  package for
                      homological algebra},
  year =             {2006},
  pages =            {29\texttt{\symbol{45}}\texttt{\symbol{45}}32},
  note =             {\href
                      {https://www.algebra.mathematik.uni-siegen.de/barakat/eaca/homalg_eaca06.pdf}
                      {\texttt{https://www.algebra.mathematik.uni\texttt{\symbol{45}}siegen.de/}\discretionary
                      {}{}{}\texttt{barakat/}\discretionary
                      {}{}{}\texttt{eaca/}\discretionary
                      {}{}{}\texttt{homalg{\textunderscore}eaca06.pdf}}},
  printedkey =       {BR06}
}
@manual{ homalg,
  author =           {Barakat, M. and Robertz, D.},
  title =            {The                   homalg                   package
                      \texttt{\symbol{45}}\texttt{\symbol{45}} Maple},
  year =             {2003\texttt{\symbol{45}}2008},
  note =             {\href
                      {https://algebra.mathematik.uni-siegen.de/barakat/homalg_in_maple/}
                      {\texttt{https://algebra.mathematik.uni\texttt{\symbol{45}}siegen.de/}\discretionary
                      {}{}{}\texttt{barakat/}\discretionary
                      {}{}{}\texttt{homalg{\textunderscore}in{\textunderscore}maple/}}},
  printedkey =       {BR08}
}
@manual{ homalg-package,
  author =           {Barakat, M.},
  title =            {homalg    \texttt{\symbol{45}}\texttt{\symbol{45}}   A
                      homological   algebra  meta\texttt{\symbol{45}}package
                      for computable Abelian categories},
  year =             {2007\texttt{\symbol{45}}2020},
  note =             {\href    {https://homalg-project.github.io/pkg/homalg}
                      {\texttt{https://homalg\texttt{\symbol{45}}project.github.io/}\discretionary
                      {}{}{}\texttt{pkg/}\discretionary
                      {}{}{}\texttt{homalg}}},
  printedkey =       {Bar20}
}
@manual{ homalg-project,
  author =           {The homalg team},
  title =            {The homalg project},
  year =             {2003\texttt{\symbol{45}}2022},
  note =             {\href
                      {https://homalg-project.github.io/prj/homalg_project/}
                      {\texttt{https://homalg\texttt{\symbol{45}}project.github.io/}\discretionary
                      {}{}{}\texttt{prj/}\discretionary
                      {}{}{}\texttt{homalg{\textunderscore}project/}}},
  printedkey =       {Tht22}
}
@article{ BR,
  author =           {Barakat, M. and Robertz, D.},
  title =            {homalg   \texttt{\symbol{45}}\texttt{\symbol{45}}  {A}
                      {M}eta\texttt{\symbol{45}}{P}ackage  for {H}omological
                      {A}lgebra},
  journal =          {J. Algebra Appl.},
  volume =           {7},
  number =           {3},
  year =             {2008},
  pages =            {299\texttt{\symbol{45}}\texttt{\symbol{45}}317},
  note =             {\href             {https://arxiv.org/abs/math/0701146}
                      {\texttt{https://arxiv.org/}\discretionary
                      {}{}{}\texttt{abs/}\discretionary
                      {}{}{}\texttt{math/}\discretionary
                      {}{}{}\texttt{0701146}}},
  fjournal =         {Journal of Algebra and its Applications},
  issn =             {0219\texttt{\symbol{45}}4988},
  mrclass =          {16E30 (16\texttt{\symbol{45}}04)},
  mrnumber =         {MR2431811},
  eprint =           {arXiv:math.AC/0701146},
  printedkey =       {BR08}
}
@article{ MP_SCO,
  author =           {Moerdijk, I. and Pronk, D. A.},
  title =            {Simplicial cohomology of orbifolds},
  journal =          {Indag. Math. (N.S.)},
  volume =           {10},
  number =           {2},
  year =             {1999},
  pages =            {269\texttt{\symbol{45}}\texttt{\symbol{45}}293},
  fjournal =         {Koninklijke  Nederlandse  Akademie  van Wetenschappen.
                      Indagationes Mathematicae. New Series},
  issn =             {0019\texttt{\symbol{45}}3577},
  mrclass =          {55N91 (55N30 57M60)},
  mrnumber =         {MR1816220 (2002b:55012)},
  mrreviewer =       {Darryl McCullough},
  printedkey =       {MP99}
}
@manual{ RingsForHomalg,
  author =           {Barakat,  M. and G{\"o}rtzen, S. and Kirschmer, M. and
                      Lange\texttt{\symbol{45}}Hegermann, M.},
  title =            {RingsForHomalg
                      \texttt{\symbol{45}}\texttt{\symbol{45}}  Dictionaries
                      of external rings},
  year =             {2007\texttt{\symbol{45}}2008},
  note =             {\href
                      {https://homalg-project.github.io/pkg/RingsForHomalg/}
                      {\texttt{https://homalg\texttt{\symbol{45}}project.github.io/}\discretionary
                      {}{}{}\texttt{pkg/}\discretionary
                      {}{}{}\texttt{RingsForHomalg/}}},
  printedkey =       {BGKL08}
}
@manual{ SCO,
  author =           {G{\"o}rtzen, S.},
  title =            {SCO           \texttt{\symbol{45}}\texttt{\symbol{45}}
                      Simplicial Cohomology of Orbifolds},
  year =             {2007\texttt{\symbol{45}}2008},
  note =             {\href      {https://homalg-project.github.io/pkg/SCO/}
                      {\texttt{https://homalg\texttt{\symbol{45}}project.github.io/}\discretionary
                      {}{}{}\texttt{pkg/}\discretionary {}{}{}\texttt{SCO/}}},
  printedkey =       {G{\"o}r08}
}
@manual{ Gauss,
  author =           {G{\"o}rtzen, S.},
  title =            {GAP Package Gauss},
  year =             {2007\texttt{\symbol{45}}2008},
  note =             {\href    {https://homalg-project.github.io/pkg/Gauss/}
                      {\texttt{https://homalg\texttt{\symbol{45}}project.github.io/}\discretionary
                      {}{}{}\texttt{pkg/}\discretionary
                      {}{}{}\texttt{Gauss/}}},
  printedkey =       {G{\"o}r08}
}
@manual{ GaussForHomalg,
  author =           {G{\"o}rtzen, S.},
  title =            {GaussForHomalg
                      \texttt{\symbol{45}}\texttt{\symbol{45}}         Gauss
                      functionality for the homalg project},
  year =             {2007\texttt{\symbol{45}}2008},
  note =             {\href
                      {https://homalg-project.github.io/pkg/GaussForHomalg/}
                      {\texttt{https://homalg\texttt{\symbol{45}}project.github.io/}\discretionary
                      {}{}{}\texttt{pkg/}\discretionary
                      {}{}{}\texttt{GaussForHomalg/}}},
  printedkey =       {G{\"o}r08}
}
@manual{ GAPDoc,
  author =           {L{\"u}beck, F. and Neunh{\"o}ffer, M.},
  title =            {GAP Package GAPDoc},
  year =             {2007\texttt{\symbol{45}}2008},
  note =             {\href
                      {http://www.math.rwth-aachen.de/~Frank.Luebeck/GAPDoc}
                      {\texttt{http://www.math.rwth\texttt{\symbol{45}}aachen.de/}\discretionary
                      {}{}{}\texttt{\texttt{\symbol{126}}Frank.Luebeck/}\discretionary
                      {}{}{}\texttt{GAPDoc}}},
  printedkey =       {LN08}
}
@mastersthesis{ Goe,
  author =           {G{\"o}rtzen, S.},
  title =            {Simplicial Cohomology of Orbifolds},
  school =           {RWTH Aachen University},
  year =             {2008},
  note =             {in preparation},
  printedkey =       {G{\"o}r08}
}
@book{ MR1269324,
  author =           {Weibel, C. A.},
  title =            {An introduction to homological algebra},
  publisher =        {Cambridge University Press},
  series =           {Cambridge Studies in Advanced Mathematics},
  volume =           {38},
  address =          {Cambridge},
  year =             {1994},
  pages =            {xiv+450},
  isbn =             {0\texttt{\symbol{45}}521\texttt{\symbol{45}}43500\texttt{\symbol{45}}5;
                      0\texttt{\symbol{45}}521\texttt{\symbol{45}}55987\texttt{\symbol{45}}1},
  mrclass =          {18\texttt{\symbol{45}}01     (16\texttt{\symbol{45}}01
                      17\texttt{\symbol{45}}01      20\texttt{\symbol{45}}01
                      55Uxx)},
  mrnumber =         {MR1269324 (95f:18001)},
  mrreviewer =       {Kenneth A. Brown},
  printedkey =       {Wei94}
}
@book{ MR1438306,
  author =           {Gelfand, S. I. and Manin, Y. I.},
  title =            {Methods of homological algebra},
  publisher =        {Springer\texttt{\symbol{45}}Verlag},
  address =          {Berlin},
  year =             {1996},
  pages =            {xviii+372},
  note =             {Translated from the 1988 Russian original},
  isbn =             {3\texttt{\symbol{45}}540\texttt{\symbol{45}}54746\texttt{\symbol{45}}0},
  mrclass =          {18\texttt{\symbol{45}}02 (18Exx 18Gxx 55U35)},
  mrnumber =         {MR1438306 (97j:18001)},
  printedkey =       {GM96}
}
@unpublished{ WGC,
  author =           {G{\"o}rtzen, S.},
  title =            {Wallpaper Group Cohomology},
  year =             {2008},
  note =             {\href      {http://wwwb.math.rwth-aachen.de/goertzen/}
                      {\texttt{http://wwwb.math.rwth\texttt{\symbol{45}}aachen.de/}\discretionary
                      {}{}{}\texttt{goertzen/}}},
  printedkey =       {G{\"o}r08}
}