@Unpublished{K-theory/0720,
  author = 	 {{Leonid Positselski }},
  title = 	 {{Koszul property and Bogomolov's conjecture }},
  note = 	 {{Preprint, February 4, 2005, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0720/}}}
}