Prado, R. de M. et al. 2002. Evaluation of slag and calcareous rocks as corrective of the acidity of the ground in the culture of lettuce. Pesquisa Agropecuaria Brasileira. 37, 4 (Apr. 2002), 539–546. DOI:https://doi.org/10.1590/S1678-3921.pab2002.v37.6372.