M. C. Frias, C. F. Pereira, V. M. Pinheiro, M. S. Pinheiro, and C. F. Rocha, “Frequency of chlamydia trachomatis ureaplasma urealyticum and mycoplasma hominis in endocervix of women during menacme”, DST, vol. 13, no. 3, pp. 5–22, Sep. 2001.