@Unpublished{K-theory/0743,
  author = 	 {{Hans-Joachim Baues  and Fernando Muro }},
  title = 	 {{The characteristic cohomology class of a triangulated category }},
  note = 	 {{Preprint, July 12, 2005, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0743/}}}
}