Nilsson , B. Ove, Mogens Knoth, and Eva Nathan. 1980. ā€œScanning Electron Microscopy of the Responses of Postmenopausal Endometrium to Treatment With Estriol and Estriolprogesteroneā€. Upsala Journal of Medical Sciences 85 (1):1-6. https://doi.org/10.3109/03009738009179166.