Caballero, S.S.U. et al. (2014) “Leaching of N derived from the soil and from [(15NH4) 2SO4] fertilizer during the growth cycle of bean plants”, Pesquisa Agropecuaria Brasileira, 21(1), pp. 25–31. doi:10.1590/S1678-3921.pab1986.v21.14652.