Tansiri, B., Vasuwat, Y. and Vangnai, S. (1974) “Rhizobium japonicum Strains Effective on Nitrogen Fixation with Soybean S.J. 2 in Korat Soil Series”, Agriculture and Natural Resources. Bangkok, Thailand, 8(1), pp. 19–22. available at: https://li01.tci-thaijo.org/index.php/anres/article/view/240675 (accessed: 20 September 2026).