@Unpublished{K-theory/0831,
  author = 	 {{Sunil K. Chebolu, J. Daniel Christensen, and Jan Minac}},
  title = 	 {{Ghosts in modular representation theory}},
  note = 	 {{Preprint, April 1, 2007, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0831/}}}
}