@Unpublished{K-theory/0149,
  author = 	 {{Marek Szyjewski}},
  title = 	 {{On the Witt ring of a relative projective line}},
  note = 	 {{Preprint, September 1, 1996, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0149/}}}
}