By Zhou Daowei   Wang Tianhui   Valentine Ian   in Canadian Journal of Botony

ISSN:1480-3305|83|1|28-36

NRC Research Press‎(2005)‎

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By Pearson Craig J   Zuo Heping   Valentine Ian   Unkovich Murray   in International Journal of Agricultural Sustainability

ISSN:1747-762X|1|2|95-107

Taylor & Francis Ltd‎(2003)‎

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