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  categories[117X                                                     (2007--2020),
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  [[20XG\t08[120X]  [16XG\"{o}rtzen,  S.[116X,  [17XSimplicial  cohomology  of  orbifolds[117X,  Master's
  thesis,           RWTH           Aachen          University          (2008),
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  [[20XMP99[120X]  [16XMoerdijk,  I.  and Pronk, D. A.[116X, [17XSimplicial cohomology of orbifolds[117X,
  [18XIndag.       Math.       (N.S.)[118X,      [19X10[119X,      2      (1999),      269--293,
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  [32X
