1. Freud, S.: Instincts and their Vicissitudes (1915), Psychoanalytic Electronic Publishing http://www.p-e-p.org/pepcd.htm
2. Albrecht-Buehler, G.: Is Cytoplasm Intelligent too? In: Shay, J. (ed.) Muscle and Cell Motility VI, pp. 1–21 (1985)
3. Albrecht-Buehler, G.: http://www.basic.northwestern.edu/g-buehler/cellint0.htm (updated 21 Jan. 2007)
4. von Neumann, J.: The Theory of self reproducing automata (Edited by Burks, A.). Univ. of Illinois Press, Urbana (1966)
5. Conway, J.: Game of Life. Wikipedia: http://en.wikipedia.org/wiki/Conway%27s_Game_of_Life