1. The genetics of peptic ulcer;A, I.Ellis;Scand J Gatstroen'tetrol,1985
2. Gastric ulccr: classification, blood group characteristics, secretion patterns and pathogenesis;Johnson, H.D.;Ann Surg
3. Are gastric and duodenal ulcers separate diseascs or do they form a continuum'?;Kirk, R.M.;Dig Dis Sdi
4. Gastric and duodenal ulcer are each many diffcrent diseases;Rottcr, J.I.;Dig Dis Scei,1981
5. Clinical data and characteristics diffcrcntiating types of peptic ulcer;K, Vesely K.T.Kubickova Z.Dvorakova M.Zvolankova;Glit,1968