1. H. Bergson, L’évolution créatrice (Paris, 1907). English Translation by A. Mitchell, Creative Evolution (The Modern Library, New York, 2007).
2. C. Mereschkowski, “Über Natur und Ursprung der Chromatophoren im Pflanzenreiche,” Biol. Centralbl., 25, 593–604 (1905).
3. A. S. Famintsyn, “On the Role of Symbiosis in the Evolution of Organisms,” Tr. St. Petersb. O-va Ispyt. Prir. 38, 141–170 (1907).
4. C. S. Mereschkowski, Theory of Two Plasmas as a Principle of Symbiogenesis—A New Science of Organism Origin (Kazan, 1909) [in Russian].
5. L. Margulis, Origins of Eukaryotic Cells (New Haven, Yale University Press, 1970).