1. Allen, P.M.: Evolution: Why the whole is greater than the sum of the parts, in: W. Soeder and F.R. Drepper (Eds.),Ecodynamics, Springer Verlag, Berlin, 1988.
2. Assimacoupoulis, D.: Thermodynamic theory of interacting population,J. Math. Phys. Sci. 21 (1987), 287.
3. Auger, P.:Dynamics and Thermodynamics of Hierarchically Organized Systems, Pergamon, Oxford, 1989.
4. Brooks, D.R. and Wiley, E.O.:Evolution as Entropy, Chicago Univ. Press, Chicago, 1986.
5. Chakrabarti, C.G. and Ghosh, Sutapa: The extropic model and analysis of complex systems,Syst. Anal. Modelling Stimulation, in press.