Shugart, H.H., G.B. Bonan, D.L. Urban, W.K. Lauenroth, W.J. Parton, G.M. Hornberger. 1989. Computer Models and Long Term Ecological Research, p. 217-266. In W. Goerke (ed.), Long-term Ecological Research: A Global Perspective. The German National Committee for the UNESCO-Programme, "Man and the Biosphere" (MAB), Bonn, DDR.