John W. Eaton, David Bateman, Soren HaubergNetwork Theory Ltd., October 2008 (book)
(178), Max Planck Institute, octomber 2008 (techreport) ,
Wood, F., Grollman, D. H., Heller, K. A., Jenkins, O. C.,(CS-08-07), Brown University, Department of Computer Science, 2008 (techreport)
Jepson, A. D., Fleet, D. J.,US Pat. 6,954,544, October 2005 (patent)
IEEE Conf. on Computer Vision and Pattern Recognition (CVPR), Video Proceedings,, pages: 1202, 2005 (patent)
US Pat. 6,560,281, May 2003 (patent) , Ju, S., Minneman, S., Kimber, D.
US Pat. 6,526,156, Febuary 2003 (patent) , Jepson, A.