1. Arieti, S. E. (1969). Toward a unifying theory of cognition. In General systems theory and psychiatry (pp. 193–209). Boston: Litle Brown and Company.
2. Ashby, W. R. (1958). Requisite variety and its implications for the control of complex systems. Cybernetica, 1(2), 83–99.
3. Ashby, R. (1961). An introduction to cybernetics. London: Chapman & Hall Ltd.
4. Atherton, J., & Blaser, M. (2009). Coadaptation of helicobacter pylori and humans: Ancient history, modern implications. The Journal of Clinical Investigation, 119(9), 2475–2487.
5. Barrat, A., & Weigt, M. (2000). On the properties of small-world network models. The European Physical Journal B-Condensed Matter and Complex Systems, 13(3), 547–560.