The significance of diminutive colonic polyps found at flexible sigmoidoscopyMichael E. Ryan, John B. Wyman, John P. Kirchner et al.|Gastrointestinal Endoscopy|1989Cited by 38
Barium enema versus colonoscopy for patients with polyps found during flexible sigmoidoscopyRobert G. Norfleet, Kevin Parent, John B. Wyman et al.|Gastrointestinal Endoscopy|1991Cited by 28