@Unpublished{K-theory/0563,
  author = 	 {{Daniel Dugger, Sharon Hollander, and Daniel C. Isaksen}},
  title = 	 {{Hypercovers and simplicial presheaves}},
  note = 	 {{Preprint, May 3, 2002, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0563/}}}
}