[1] Keijo Lehtonen,Kari Himminen,Martti Ketola. Organic Geochemistry,2001,32,33.
[8] Singhal R M,Soni S. Proc. Indian Natn. Sci. Acad. 1988,54A(2),320.
[9] Singhal R M,Sharma S D. J. Indian Soc. Soil Sci.,1982,31,182
[1] Keijo Lehtonen,Kari Himminen,Martti Ketola. Organic Geochemistry,2001,32,33.
[8] Singhal R M,Soni S. Proc. Indian Natn. Sci. Acad. 1988,54A(2),320.
[9] Singhal R M,Sharma S D. J. Indian Soc. Soil Sci.,1982,31,182
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