By Usman S.   Singh S.P.   Rawat Y.S.   in Annals of Botany

ISSN:0305-7364|84|1|87-94

Oxford University Press‎(1999)‎

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By Usman S.   Pratap Singh S.   Singh Rawat Y.   in European Journal of Soil Biology

ISSN:1164-5563|36|2|65-71

Elsevier‎(2000)‎

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