1. A.J. Lotka, Elements of Physical Biology (Williams and Wilkins, Baltimore, 1925)
2. V. Volterra, Nature 118, 558 (1926)
3. H.I. Freedman, Deterministic Mathematical Models in Population Ecology (Marcel Dekker, New York, 1980)
4. F. Brauer, C. Castillo-Chavez, Mathematical Models in Population Biology and Epidemiology (Springer, Heidelberg, 2000)
5. J. Hofbauer, K. Sigmund, The Theory of Evolution and Dynamical Systems (Cambridge University, Cambridge, 1988)