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Koers
On-line version ISSN 0023-270X

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VAN DER WALT, J.L.; MENTZ, P.J.; BREED, J.A.  and  COETSEE, L.D.. Koers (Online) [online]. 2008, vol.73, n.3, pp. 469-487. ISSN 0023-270X.


 


 

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