Nilsson B. O., Knoth M. and Nathan E. (1980) ā€œScanning Electron Microscopy of the Responses of Postmenopausal Endometrium to Treatment with Estriol and Estriolprogesteroneā€, Upsala Journal of Medical Sciences, 85(1), pp. 1-6. doi: 10.3109/03009738009179166.