1. Preparation of ova for scanning electron microscopy;Bergström;Ups. J. Med. Sci.,1971
2. Shedding of the zona pellucida in normal pregnancy and in various hormonal states in the mouse. A scanning electron microscope study;Bergström;Z. Anat. Entw.-gesch.,1971
3. Delay of implantation by ovariectomy or lactation in the mouse. A scanning electron microscope study;Bergström,1971
4. Scanning electron microscopy of ovo-implantation;Bergström,1971
5. Ultrastructural response of blastocysts and uterine epithelium upon a deprivation of progesterone during delayed implantation in the mouse;Bergström,1972