TY  - RPRT
TI  - Digital subtraction in defecography.
AU  - A P Brady
AU  - S Somers
AU  - D Hough
AU  - G W Stevenson
DO  - 10.1007/bf00200406
UR  - https://pubmed.ncbi.nlm.nih.gov/7620417/
ID  - 7620417
ER  -