Paul R. Hilfiker, Jörg F. Debatin, Werner Schwizer, Andreas W. Schoenenberger, Michael Fried, Borut Marincek,
MR defecography: depiction of anorectal anatomy and pathology. Journal of Computer Assisted Tomography. ,vol. 22, pp. 749- 755 ,(1998) ,
10.1097/00004728-199809000-00016