@Unpublished{K-theory/0002,
  author = 	 {{Daniel R. Grayson}},
  title = 	 {{Weight filtrations in algebraic K-theory}},
  note = 	 {{Preprint, December 20, 1994, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0002/}}}
}