References
  
  [Bor01]  Borge, I. C., A cohomological approach to the classification of
  p-groups,                         Oxford                         (2001),
  http://www.maths.abdn.ac.uk/~bensondj/html/archive/borge.html
  
  [CTVZ03]  Carlson,  J.  F., Townsley, L., Valeri-Elizondo, L. and Zhang,
  M.,  Cohomology  rings  of  finite  groups,  Kluwer Academic Publishers,
  Algebras and Applications, 3, Dordrecht (2003), xvi+776
  
  [Kra66]  Kraines,  D.,  Massey higher products, Trans. Amer. Math. Soc.,
  124 (1966), 431--449
  
  
  
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