  
  
  [1XReferences[101X
  
  [[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
