Spies, H, Gröning, H, Haußecker, H, Jähne, B and Haußecker, H (2000). 
Analyzing particle movements at soil interfaces. 
Computer Vision and Applications. A Guide for Students and Practitioners. Academic Press. 648--649
  Haußecker, H, Spies, H and Jähne, B (2000). 
Motion. 
Computer Vision and Applications - A Guide for Students and Practitioners. Academic Press. 347--395