1. Eldredge, N. and Gould, S. J., in: Models in Paleobiology, p. 82. Ed. T. J. M. Schopf. Freeman, Cooper & Co., San Francisco 1972; Gould, S. J., Paleobiology6 (1980) 119; Gould, S. J., and Eldredge, N., Paleobiology3 (1977) 115.
2. Mayo, O., Natural Selection and Its Constraints. Academic Press, London 1983.
3. Gould, S. J., Ontogeny and Phylogeny. Harvrd University Press, Cambridge Mass. 1977.
4. Mather, K., Heredity7 (1953) 297.
5. Soulé, M. E., Am. Anat.120 (1953) 297.