@Unpublished{K-theory/0730,
  author = 	 {{Leonid Positselski }},
  title = 	 {{Koszul property and Bogomolov's conjecture }},
  note = 	 {{Preprint, March 12, 2005, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0730/}}}
}