  
  
  [1XReferences[101X
  
  [[20Xhpa10[120X] [16Xhomalg project authors, T.[116X, [17XThe homalg project[117X (2003-2010), ((http://homalg.math.rwth-aachen.de/)).
  
  [[20XSch03[120X]  [16XSchenck,  H.[116X,  [17XComputational  algebraic  geometry[117X,  Cambridge  University  Press, London Mathematical Society Student Texts, [19X58[119X,
  Cambridge (2003), xiv+193 pages.
  
  
  
  [32X
