Wikipedia is great for math and physics. Almost everyone I know uses it for engineering. and I read through that part to make sure it was accurate. A scientific paper would be debating additional variables or constants added into an equation like for over fishing.
BTW a different type of population model is used for predator/prey and looks really pretty.
the equations that are used in this video are as simple as
dx/dt = -ax + bxy dy/dt = cx - dxy
http://www.youtube.com/watch?v=cN2H16869Vo