By Allemann J.   Robbertse P.J.   Hammes P.S.   in Field Crops Research

ISSN:0378-4290|83|1|35-39

Elsevier‎(2003)‎

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By Allemann J.   Laurie S.M.   Thiart S.   Vorster H.J.   in South African Journal of Botany

ISSN:0254-6299|70|1|60-66

NISC Pty Ltd‎(2004)‎

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