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Saraf, C S and Rupela, O P and Hegde, D M and et al, . (1998) Biological nitrogen fixation and residual effects of winter grain legumes in rice and wheat cropping systems of the Indo-Gangetic Plain. In: Residual effects of legumes in rice and wheat cropping systems of the Indo-Gangetic plain. Oxford & IBH Publishing Co. Pvt. Ltd., New Delhi, pp. 14-30. ISBN 81-204-1297-4