By Arthur GD   Stirk WA   van Staden J   in South African Journal of Botany

ISSN:0254-6299|69|2|207-211

NISC Pty Ltd‎(2003)‎

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By Arthur GD   Stirk WA   van Staden J   in South African Journal of Botany

ISSN:0254-6299|70|4|595-601

NISC Pty Ltd‎(2004)‎

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By Arthur G.D.   Jager A.K.   Van Staden J.   in Environmental and Experimental Botany

ISSN:0098-8472|45|1|55-61

Elsevier‎(2001)‎

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