W. Smart, and M. Zhang. Proceeding of Image and Vision Computing International
Conference, page 113--118. Akaroa, New Zealand, Lincoln, Landcare Research, (November 2004)
A. Homaifar, D. Battle, and E. Tunstel. Computational Intelligence in Robotics and Automation,
CIRA '99. Proceedings. 1999 IEEE International
Symposium on, page 35--40. (8-9 November 1999)