Clutton-Brock, J.: Some Pain Threshold Studies with Particular Reference to Thiopentone, Anaesthesia15:71-72, 1960.
2.
Christensen, E.M., and Gross, E.G.: Analgesic Effects in Human Subjects of Morphine, Meperidine and Methadone, JAMA137:594-599, 1948.
3.
Moore, J., and Dundee, J.W.: Alterations in Response to Somatic Pain Associated with Anaesthesia: VII. The Effects of Nine Phenothiazine Derivatives, Brit J Anaesth33:422-431, 1961.
4.
Robson, J.G. ; Davenport, H.T.; and Su-Giyama , R.: Differentiation of Two Types of Pain by Anesthetics, Anesthesiology26:31-36, 1965.
5.
Blair, A.E.: The Efficacy of Placebo on Pain Perception Threshold, Oral Surg20: 385-391, 1965.
6.
Holliday, A.R. : The Effect of d-Lysergic Acid Morpholide upon Pain Sensitivity, Proc West Pharmacol Soc9:57-59, 1966.
7.
Allen, G.D., and Freedman, G.L.: A New Device for Analgesimetry, Anesthesiology29:594-595, 1968.
8.
Wolff, H.G.; Hardy, J.D.; and Goodell, H.: Studies on Pain. Measurement of the Effect of Morphine, Codeine and Other Opiates on the Pain Threshold and an Analysis of their Relation to the Pain Experience, J Clin Invest19:659-680, 1940.
9.
Dundee, J.W. ; Nicholl, R.M.; and Black, G.W.: Alterations in Response to Somatic Pain Associated with Anaesthesia. X. Further Studies with Inhalation Agents, Brit J Anaesth34:158-160, 1962.
10.
Tomlin, P.J. : Pethidine Compared with Pethidine plus Levallorphan and with a Placebo, Brit J Anaesth37:23, 1965.