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P. F. A.  Maderson, Alberch, P., Goodwin, B. C., Gould, S. J., Hoffman, A., Murray, J. D., Raup, D. M., de Ricqlès, A., Seilacher, A., Wagner, G. P., and Wake, D. B., ?The role of development in macroevolutionary change. Group report?, in Evolution and development. Report of the Dahlem Workshop on Evolution and Development, Berlin 1981, May 10-15, J. T.  Bonner, Ed. Berlin, Heidelber, New York: Springer-Verlag, 1982, pp. 279-312.

A.  Seilacher, ?"Hammer oysters" as secondary soft bottom dwellers?, Neues Jahrbuch für Geologie und Paläontologie Abhandlungen, vol. 164, pp. 245-250, 1982.