  
  
  [1XReferences[101X
  
  [[20XBR08[120X]   [16XBarakat,   M.   and   Robertz,   D.[116X,  [17Xhomalg  project[117X  (2003-2008),
  ((http://wwwb.math.rwth-aachen.de/homalg)).
  
  [[20XGör08a[120X]  [16XGörtzen,  S.[116X, [17XSimplicial Cohomology of Orbifolds[117X, Master's thesis,
  RWTH Aachen University (2008), ((in preparation)).
  
  [[20XGör08b[120X]     [16XGörtzen,     S.[116X,    [17XWallpaper    Group    Cohomology[117X    (2008),
  ((http://wwwb.math.rwth-aachen.de/goertzen/)).
  
  [[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.
  
  
  
  [32X
