Ferrão-Filho, A. da S., R. Cunha, V. F. Magalhães, M. C. S. Soares, and D. F. Baptista. “Evaluation of Sub-Lethal Toxicity of Cyanobacteria on the Swimming Activity of Aquatic Organisms by Image Analysis”. Ecotoxicology and Environmental Contamination, vol. 2, no. 2, July 2007, pp. 93-100, doi:10.5132/jbse.2007.02.001.