1. Defecation block in cases of deep rectogenital pouch. A surgical, roentgenological and embryological study with special reference to morphological conditions;Walldén;Acta Chir Scand,1952
2. Procidentia of the rectum studied with cineradiography;Broden;Dis Colon Rectum,1968
3. Defecography;Mahieu;Gastrointest Radiol,1984
4. Defecography;Mahieu;Gastrointest Radiol,1984
5. Evacuation proctography and anal endosonography;Bartram,1991