@Unpublished{K-theory/0923,
  author = 	 {{Bruno Kahn and R. Sujatha}},
  title = 	 {{Birational motives, I pure birational motives}},
  note = 	 {{Preprint, February 27, 2009, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0923/}}}
}