W. Obrecht

The effects of psychological and environmental stressors on peristaltic esophageal contractions in healthy volunteers.

C. Dalton, J. Richter, L. Bradley, 1987, Psychophysiology.

Psychological comparison of patients with nutcracker esophagus and irritable bowel syndrome

J. Richter, L. Bradley, K. Anderson, 1986, Digestive Diseases and Sciences.