@Unpublished{K-theory/0644,
  author = 	 {{Charles Walter }},
  title = 	 {{Grothendieck-Witt groups of projective bundles }},
  note = 	 {{Preprint, July 1, 2003, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0644/}}}
}