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200 1 $aMathematical$eModelling in Biology and Ecology Proceedings of a Symposium held at the CSIR, Pretoria, South Africa July 5-6, 197 9$fEdited by W. M. Cetz
210   $aBerlin [etc.]$cSpringer-Verlag$d1980
225 1 $aLecture notes in biomathematics$v33
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