de Azevedo, W.R. et al. 2002. Boron effects on nodule development in pea plants cultivated in lowland soils. Pesquisa Agropecuaria Brasileira. 37, 8 (Aug. 2002), 1137–1143. DOI:https://doi.org/10.1590/S1678-3921.pab2002.v37.6447.