@Unpublished{K-theory/0481,
  author = 	 {{Winfried Bruns and Joseph Gubeladze}},
  title = 	 {{Polyhedral K_2}},
  note = 	 {{Preprint, April 24, 2001, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0481/}}}
}