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Rupela, O P and Kumar Rao, J V D K and Sudarshana, M R and Usha Kiran, M and Anjaiah, V (1991) Rhizobium Germplasm Resources at ICRISAT Center. Technical Report. International Crops Research Institute for the Semi-Arid Tropics.
Kumar Rao, J V D K and Johansen, C and Usha Kiran, M (1995) Nitrogen Requirements at Different Growth Stages of Short-duration Pigeonpea (Cajanus cajan L. Millsp). Journal of Agronomy and Crop Science, 175 (1). pp. 15-28.
Rao, J V D K K and Dart, P J and Usha Kiran, M (1984) Rhizobium-induced leaf roll in pigeonpea [Cajanus cajan (L.) Millsp.]. Soil Biology and Biochemistry, 16 (1). pp. 89-91. ISSN 0038-0717