1. Von Bertalanffy, L. (1962). General system theory – a critical review. General Systems, 7, 1–20.
2. Bourbaki, N. (1960). Elements d'histoire des Mathematiques. Paris: Herman.
3. Casti, J. (1981). Systematism, system theory and social system modeling. Regional Science and Urban economics, 11, 405–424.
4. Caratheodory, C. (1911). Uber den variabilitats bereich der fourier'schen constanten von positiven harmonischen functionen. Rend. Circ. Mat. 32, Palermo, 198–201.
5. Dendrinos, D., & Sonis, M. (1990). Chaos and Socio-Spatial Dynamics. New York: Springer.