de Carvalho, Carlos Henrique Siqueira, et al. “Relationship Between Crop Load, N, P, K, Ca, Mg and Starch Content and the Dieback of Catimor (<i>Coffea arabica< I> L.)”. Pesquisa Agropecuaria Brasileira, vol. 28, no. 6, June 1993, pp. 665-73, doi:10.1590/S1678-3921.pab1993.v28.3925.