@Unpublished{K-theory/0945,
  author = 	 {{Olivier Haution}},
  title = 	 {{On the first Steenrod square for Chow groups}},
  note = 	 {{Preprint, October 15, 2009, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0945/}}}
}