Ventura, D., Simoes AL, Tomaz S, Lago M, Costa MF, Costa MTV, Canto-Pereira, L., Faria MAM, Souza, J., & Silveira, L. (2005). Colour vision and contrast sensitivity losses of mercury intoxicated industry workers in Brazil. Environmental Toxicology and Pharmacology, 19(3), 523-529. doi:doi:10.1016/j.etap.2004.12.016.