1. Evacuation proctography and anal endosonography;Bartram,1992
2. Vagina-Surgery;Brown,1989
3. Defecation and the anal sphincters;Duthie;Clinical Gastroenterology,1982
4. Defecography;Ekberg;Radiology,1985
5. Clinical relevance of anorectal function investigations;Felt-Bersma,1989