1. Chapter 8, Connective Tissues and Stains;Bradbury,1977
2. Vaginal prolapse;Cox,1987
3. Changes in cervical function at parturition;Fitzpatrick;Annales de Recherches Véterinaires,1977
4. The cervix of the sheep and goat during parturition;Fitzpatrick;Animal Reproduction Science,1979
5. Changes in metabolism of collagen in genitourinary prolapse;Jackson;The Lancel,1996