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Giller, K E and Sudarshana, M R and Thompson, J A and Rupela, O P (1988) Evaluation of 15N-isotope dilution for measurement of nitrogen fixation in chickpea (Cicer arietinum L.). Biology and Fertility of Soils, 6 (4). pp. 347-351.
Rupela, O P and Mittal, S and Dart, P J and Thompson, J A and Sudarshana, M R and Toomsan, B and Annapurna, K (1991) Variability in Different Characters of Bacteria Nodulating Chickpea. International Chickpea Newsletter, 25. pp. 35-36.