1. 1 . Melzack R. A. The Puzzle of Pain. New York: Basic Books 1973.
2. 2. Engel. G. L. Psychogenic pain and the pain-prone patient. Am. J. Med. 26 (1959) 899-918
3. 3. Freeman W.. and Watts J. W. Psychosurgery in the Treatment of Mental Disorders and Intractable Pain. Springfield III.: Charles C Thomas Publisher 1950.
4. 4. Stembach R. A. Strategies and tactics in the treatment of patients with pain. In Crue B. L (ed.). Pain and Suffering. Springfield III.: Charles C Thomas. Publisher 1970.
5. 5. Stembach R. A. Pain: A Psychophysiological Analysis. New York: Academic Press 1968.