(en) Eldredge, N. & S. J. Gould, 1972. Punctuated equilibria: an alternative to phyletic gradualism. In: Models in Paleobiology, San Francisco, Freeman, Cooper & Co.pp. 82-115. full text
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(en) Gould, S.J. & N. Eldredge, 1977. Punctuated equilibria: the evolution reconsidered. Paleobiology 3(2):115-151. full text
