1. Volterra, V.: Théorie mathématique de la lutte pour la vie. Gauthier-Villars, Paris (1931)
2. Lotka, A.J.: Elements of Physical Biology. Williams & Wilkins, Baltimore (1925)
3. Kolmogoroff, A.N.: Sulla theoria di Volterra della lotta per l’esistenza. G. Ist. Ital. Attuari 7, 74–80 (1936)
4. Kostitzin, V.A.: Mathematical Biology. Harrap, Bromley (1939)
5. Smith, M.: Models in Ecology. Cambridge University Press, Cambridge (1974)