Segall, R. H., and L. López-Matos. “Control of Damping-off of Tobacco in Seedbeds by the Use of Gaseous Soil Fumigants”. The Journal of Agriculture of the University of Puerto Rico, vol. 40, no. 1, Jan. 1956, pp. 62-66, doi:10.46429/jaupr.v40i1.12661.