By Spence R.D.   Wu H.I.   in Journal of Theoretical Biology

ISSN:0022-5193|177|1|59-65

Academic Press‎(1995)‎

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By Spence R.D.   Gilliam T.M.   Mattus C.H.   Mattus A.J.   in Waste Management

ISSN:0956-053X|19|7|453-465

Elsevier‎(1999)‎

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