1. Bubois-Reymond: Quoted by Basmajian, J. V.: Muscles Alive: Their Functions Revealed by Electromyography. Baltimore, The Williams & Wilkins Company, 1962, p. 2.
2. Gabriel, W. B.: Principles and Practices of Rectal Surgery. Ed. 4, Springfield, Illinois, Charles C Thomas, 1948, p. 119.
3. Galvani: Quoted by Basmajian, J. V.: Muscles Alive: Their Functions Revealed by Electromyography. Baltimore, The Williams & Wilkins Company, 1962, p. 2.
4. Haskell, B. and H. Rovner: A modified Thiersch operation for complete rectal prolapse using a Teflon prosthesis. Dis. Colon & Rectum.6: 192, 1963.
5. Parks, A. G., N. H. Porter, and J. Melzak: Experimental study of the reflex mechanism controlling the muscles of the pelvic floor. Dis. Colon & Rectum.5: 407, 1962.