G. M. Paulino, B. J. R. Alves, D. G. Barroso, S. Urquiaga, and J. A. A. Espindola, “Biological fixation and nitrogen transfer by three legume species in mango and soursop organic orchards”, PAB, vol. 44, no. 12, pp. 1598–1607, Dec. 2010.