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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.
Toomsan, B and Rupela, O P and Mittal, S and Dart, P J (1979) Counting chickpea rhizobia in soils. International Chickpea Newsletter, 1. pp. 10-11.
Rupela, O P and Toomsan, B and Mittal, S and Dart, P J and Thompson, J A (1987) Chickpea rhizobium populations: Survey of influence of season, soil depth and cropping pattern. Soil Biology and Biochemistry, 19 (3). pp. 247-252. ISSN 0038-0717
Toomsan, B and Rupela, O P and Mittal, S and Dart, P J and Clark, K W (1984) Counting Cicer-Rhizobium using a plant infection technique. Soil Biology and Biochemistry, 16 (5). pp. 503-507. ISSN 0038-0717