S. M. Ja’afar, H. Awang, R. M. R. Ibrahim, Z. Yasin, and Z. Dollah, “Absence of Endocervical / Transformation Zone Component in Cervical Papanicolaou Smears in Northeastern Region of Peninsular Malaysia: Prevalence and Risk Factors”, Int. J. Hum. Health Sci., vol. 4, no. 3, pp. 178–183, Feb. 2020.