Höchter W, Weingart J, Kühner W, Frimberger E, Ottenjann R. Angiodysplasia in the colon and rectum. Endoscopic morphology, localisation and frequency. Endoscopy. 1985 Sep;17(5):182-5. https://www.ncbi.nlm.nih.gov/pubmed/3876926
Mitchell SH, Schaefer DC, Dubagunta S (2004). "A new view of occult and obscure gastrointestinal bleeding". Am Fam Physician. 69 (4): 875–81. PMID 14989574.