@Unpublished{K-theory/0868,
  author = 	 {{Andrew J. Blumberg and Michael A. Mandell}},
  title = 	 {{Algebraic K-theory and abstract homotopy theory}},
  note = 	 {{Preprint, September 14, 2007, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0868/}}}
}