By Richards G.R.   in Economic Modelling

ISSN:0264-9993|17|1|13-34

Elsevier‎(2000)‎

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By Richards G. R.   Veltkamp C. J.   Chubb J. C.   in Journal of Natural History

ISSN:1464-5262|34|3|341-353

Taylor & Francis Ltd‎(2000)‎

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