S. Wonodirekso, W. Hadisaputra, B. Affandi, B. Siregar, and P. A. Rogers, “Cytokeratin 8,18 and 19 expressions, epithelial shedding, and stromal extravasation in endometrium of norethisterone enanthate (NET-EN) progestogen contraceptive users (A preliminary report)”, Med J Indones, vol. 7, no. 1, pp. 16-24, Jan. 1998.