Fontes, Ruy Rezende, José de Almeida Lima, Antonio Carlos Torres, and Osmar Alves Carrijo. 2014. “Effect of Mg, B, Zn and Mo on Lettuce Production”. Pesquisa Agropecuaria Brasileira 17 (2):171-75. https://doi.org/10.1590/S1678-3921.pab1982.v17.15583.