M. A. Rodrigues, V. Gomes, L. G. Dias, J. Pires, C. Aguiar, and M. Arrobas, “Evaluation of soil nitrogen availability by growing tufts of nitrophilic species in an intensively grazed biodiverse legume-rich pasture”, Span. j. agric. res., vol. 8, no. 4, pp. 1058-1067, 1.