Barraviera, Benedito, et al. “ Glucose-6-Phosphate Dehydrogenase and Glutathione Reductase Activity in Methemoglobin Reduction by Methylene Blue and Cyst Amine: Study on Glucose-6-Phosphate Dehydrogenase-Deficient Individuals, on Normal Subjects and on Riboflavin-Treated Subjects ”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 30, no. 5, Oct. 1988, pp. 370-8, https://www.revistas.usp.br/rimtsp/article/view/28611.