1. Ferrari, Th.J., 1978. Elements of system-dynamics simulation; a textbook with exercises. Simulation Monographs, Pudoe, Wageningen, 89 pp.
2. Goudriaan, J., 1973. Dispersion in simulation models of population growth and salt movement in the soil. Neth. J. agrie. Sei. 21: 269–281.
3. Penning de Vries, F.W.T. and H.H. van Laar, 1982. Simulation of plant growth and crop production. Simulation Monographs, Pudoe, Wageningen, 308 pp.
4. Wit, C.T. de and J. Goudriaan, 1978. Simulation of eeologieal processes. Revised version. Simulation Monographs, Pudoe, Wageningen, 175 pp.
5. Blythe, S.P. Nisbet, R.M. and Gurney, W.S.C. (1984), “The Dynamics of Population Models with Distributed Maturatlon Period”. Theor. Pop. Biol. - in press.