@Unpublished{K-theory/1001,
  author = 	 {{Matilde Marcolli and Goncalo Tabuada}},
  title = 	 {{Noncommutative motives, numerical equivalence, and semi-simplicity}},
  note = 	 {{Preprint, May 15, 2011, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/1001/}}}
}