@Unpublished{K-theory/0799,
  author = 	 {{Daniel Dugger  and Daniel C. Isaksen }},
  title = 	 {{Etale homotopy and sums-of-squares formulas }},
  note = 	 {{Preprint, September 11, 2006, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0799/}}}
}