Internet links

 

 

http://www.stolaf.edu/people/mckeley/envision.dir/nonDE.lotka-volt.html
http://www.rpi.edu/dept/env-energy-eng/public_html/courses/Bungay/eco/eco.html
http://jan.ucc.nau.edu/~gaud/bio226/class/predat/lesson3-2-1.html