Balandreau J.P., Rinaudo Gérard, Oumarov M.M., Dommergues Yvon. (1974). Asymbiotic N2 fixation in paddy soils. In :
First international symposium of nitrogen fixation. Washington : Washington State University Press, p. 611-628. Proceedings of the First International Symposium on Nitrogen Fixation, Washington (USA), 1974/06/03-07.