Pflug, H. D.; Reitz, E. (1986). Evolutionary changes in the Proterozoic. Pp. 93-103 in Walliser, O.H. (ed): Global Bio-Events: A Critical Approach Proceedings of the First International Meeting of the IGCP Project 216:“Global Biological Events in Earth History” (pp. 93-103). Berlin, Heidelberg: Springer Berlin Heidelberg.
Evolutionary changes in the Proterozoic. Pp. 93-103 in Walliser, O.H. (ed): Global Bio-Events: A Critical Approach Proceedings of the First International Meeting of the IGCP Project 216:“Global Biological Events in Earth History” (pp. 93-103). Berlin, Heidelberg: Springer Berlin Heidelberg.