@Unpublished{K-theory/0853,
  author = 	 {{Do Ngoc Diep}},
  title = 	 {{Category of Noncommutative CW Complexes}},
  note = 	 {{Preprint, June 24, 2007, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0853/}}}
}