1. Boonkerd W, Rungrattanakasin W, Wadeesiriak P and Vasuvat, Y 1979 Effect of nitrogen fertilizer application on growth, nodulation, nitrogen fixation and yield of soybean, pp 182–193In Proceedings of Soil Microbiology and Plant Nutrition (somiplan) symposium held in Kuala Lumpur. Eds W J Brought, C K John, J C Rajarao and Bedalim. Malaysia, August 1976.
2. Duong T P, Diep C N, Khiem N T, Hiep N H, Toi N V, Lich N V and Nhan L T K 1984 Rhizobium inoculant for soybean (Glycine max (L.) Merrill) in Mekong Delta. I. Response of soybean to Rhizobium inoculation. Plant and Soil 79, 235–240.
3. Tin C H 1980Rhizobium japonicum inoculation onGlycerine max in Viet Nam. Soybean Genetics Newsletter 7, 97–100.