1. Andronov, A. A., Leontovich, E. A., Gordon, I.I., Maier, A. G.: Theory of dynamical systems on a plane. Israel Program for Scientific Translations, Jerusalem 1972
2. Arnold, V. I.: Ordinary differential equations. Cambridge: MIT Press 1980
3. Aronson, D. G.: Density-dependent interaction-systems. In: Steward, W. H., Ray, W. H., Conley, C. C. (eds.) Dynamics and modelling of reactive systems. New York: Academic Press 1980
4. Aronson, D. G.: The role of the diffusion in mathematical population biology: Skellam revisited. In: Fasano, A., Primicerio, M. (eds.) Lecture Notes in Biomathematics 57. Berlin Heidelberg New York: Springer 1985
5. Arrowsmith, D. K., Place, C. M.: An introduction to dynamical system. Cambridge: Cambridge University Press 1990