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2. Langley JN The Autonomic Nervous System 1921
3. Gaskell WH The Involuntary Nervous System 1920
4. Section of the sympathetic nerves of the distal part of the colon and rectum in the treatment of Hirschsprung’s disease and certain types of constipation;Rankin;Ann Surg,1930
5. The response of the internal anal sphincter in man to stimulation of the presacral nerve;Shepherd;Am J Dig Dis,1968