Boyko Kabakchiev, Dan Turner, Jeffrey Hyams, David Mack, Neal Leleiko, Wallace Crandall, James Markowitz, Anthony R. Otley, Wei Xu, Pingzhao Hu, Anne M. Griffiths, Mark S. Silverberg
PLoS One. 2010; 5(9): e13085. Published online 2010 Sep 30. doi: 10.1371/journal.pone.0013085