  
  
  [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
