  
  
  [1XReferences[101X
  
  [[20XGre00[120X] [16XGreen, E. L.[116X, [17XMultiplicative bases, Gr\"obner bases, and right Gr\"obner bases[117X, [18XJ.
  Symbolic Comput.[118X, [19X29[119X (2000), 601--623.
  
  [[20XGSZ01[120X] [16XGreen, E. L., Solberg, \. and Zacharia, D.[116X, [17XMinimal projective resolutions[117X, [18XTrans.
  Amer. Math. Soc.[118X, [19X353[119X (2001), 2915--2939.
  
  
  
  [32X
