Clone of Wonderland
From Warren C. Sanderson in Population - Development - Environment, Wolfgang Lutz (Ed.), 1994, Springer.
More readable equations in Milik et al. Environemental Modeling and Assessment 1(1996)3-17.
Additional informations in Sanderson 1995: http://dx.doi.org/10.1080/08898489509525405
Vensim graphical representation from "Meta-SD blog", Tom Fiddaman.