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Source:
Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie. Mar2010, Vol. 29 Issue 1, p10-19. 10p.
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Source:
Tydskrif vir Geesteswetenskappe. jun2010, Vol. 50 Issue 2, p216-228. 13p. 1 Diagram, 1 Chart.
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