1. The significance and treatment of obstinate hiccup;Bellingham-Smith;Practitioner,1938
2. An experimental study of hiccup;Davis;Brain,1970
3. Therapy-resistant singultus and reflux esophagitis;Guyot;Dtsch Med Wochenschr,1986
4. Hiccups and gastroesophageal reflux: cause and effect?;Fisher;Dig Dis Sci,1989
5. Hiccups;Petroianu,2005