Schuster, Myra Wilson, et al. “Detection of Chlamydia Trachomatis in Urethral Samples by Means of Direct Immunofluorescence”. Revista De Saúde Pública, vol. 23, no. 6, Dec. 1989, pp. 443-6, https://doi.org/10.1590/S0034-89101989000600001.