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2. Primary solitary lymphoid tumours of the gastrointestinal tract;Warren, S.; Lulenski, C.R.;Ann Surg,1942
3. Chronic ulcerative colitis associated with malignant disease;Bargen, J.A.;Arch Surg
4. The importance of malignant degeneration as a complication ofchronic ulcerative colitis;Cattell, R.B.; Boehme, E.J.;Gastroenterology,1947
5. Malignant lymphoma ofthe duodenum, small intestine and colon;Warren, K.W.;Surg Clin North Am,1959