Jongen, Johannes; Peleikis, Hans-Günter (July 2006). “Doppler-Guided Hemorrhoidal Artery Ligation: An Alternative to Hemorrhoidectomy”. 《Diseases of the Colon & Rectum》 49 (7): 1082–1083. doi:10.1007/s10350-006-0553-y. PMID16676142.
Jongen, Johannes; Peleikis, Hans-Günter (July 2006). “Doppler-Guided Hemorrhoidal Artery Ligation: An Alternative to Hemorrhoidectomy”. 《Diseases of the Colon & Rectum》 49 (7): 1082–1083. doi:10.1007/s10350-006-0553-y. PMID16676142.