@Unpublished{K-theory/0633,
  author = 	 {{Jean-Louis Colliot-Thelene and David Madore}},
  title = 	 {{Surfaces de del Pezzo sans point rationnel sur un corps de dimension cohomologique un}},
  note = 	 {{Preprint, May 31, 2003, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0633/}}}
}