@Unpublished{K-theory/0808,
  author = 	 {{Fernando Muro and Andrew Tonks}},
  title = 	 {{On K_1 of a Waldhausen category}},
  note = 	 {{Preprint, November 16, 2006, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0808/}}}
}