1. Ackoff, R. L., & Emery, F. E. (2005 [1972]). On purposeful systems: An interdisciplinary analysis of individual and social behavior as a system of purposeful events. New Brunswick: Aldine Transaction, Transaction Publishers.
2. Anderson, M., Deely, J., Krampen, M., Ransdell, J., Sebeok, T. A., & von Uexküll, T. (1984). A semiotic perspective on the sciences: Steps toward a new paradigm. Semiotica, 52(1/2), 7–47.
3. Arnellos, A., & Moreno, A. (2012). How functional differentiation originated in prebiotic evolution. Ludus Vitalis, 20(37), 1–23.
4. Arnellos, A., Bruni, E., El-Hani, C. N., & Collier, J. (2012). Anticipatory functions, digital-analog forms and biosemiotics: Integrating the tools to model information and normativity in autonomous biological agents. Biosemiotics, 5(1), 331–367.
5. Baldwin, M. J. (1896). A new factor in evolution. American Naturalist, 30, 441–451.