1. Valdes-Dapena A: Pathology of ulcerative colitis. In:Gastroenterology, HL Bockus, ed., Vol II, pp 647–650 Philadelphia: Saunders 1976
2. Valdes-Dapena A, Stein GS: Chronic or relapsing colitis. In:Morphologic Pathology of the Alimentary Canal. pp 660–665, 798–799 Philadelphia: Saunders 1970
3. Beck K, Dischler W, Helms M, Oehlert W:Color Atlas of Endoscopy and Biopsy of the Intestine. pp 330–331 Philadelphia: Saunders 1975
4. Burbige EJ, Bayless TM, Milligan FD: Mucosal bridging in Crohn's disease of the colon. (Abstract)Gastrointest Endosc 21:185, 1975
5. Stein GN, Roy HR, Finkelstein AK: Roentgen changes in ulcerative colitis.Semin Roentgenol 3:3–26, 1968