Choseki Furusaka, Keiji Asatsuma, Takashi Nagatsuka, Shigeru Hayashi, Studies on Bacteria in Paddy SoilReports of the Institute for Agricultural Research, Tohoku University.. ,vol. 29, pp. 19- 38 ,(1978)
P. A. Reynaud, P. A. Roger, Ndn2-fixing algal biomass in Senegal rice fields.Environmental role of nitrogen-fixing blue-green algae and asymbiotic bacteria. Proceedings of an international symposium, Uppsala, Sweden, 20-24 September 1976.. pp. 148- 157 ,(1978)