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Johansen, C and Lee, K K and Sahrawat, K L, eds. (1991) Phosphorus nutrition of grain legumes in the semi-arid tropics. International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, India. ISBN 929066200X
Lee, K K and Reddy, M V and Wani, S P and Trimurtulu, N (1996) Vesicular-arbuscular mycorrhizal fungi in earthworm casts and surrounding soil in relation to soil management of a semi-arid tropical Alfisol. Applied Soil Ecology, 3 (2). pp. 177-181. ISSN 0929-1393