G. G. Pessanha, A. A. Franco, J. Dobereiner, A. Groszmann, and D. P. P. de S. Britto, “Negative correlation of nodulation and grain production of beans (<i>Phaseolus vulgaris</i>) in soils where nitrogen is not limiting factor of plant growth”, PAB, vol. 7, no. 6, pp. 49–56, Apr. 2014.