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(1951) Archives of Neurology and Psychiatry. LXIII, 1950: Studies on Headache: 1. Effects of Carbon Dioxide-Oxygen Mixtures Given During Preheadache Phase of the Migraine Attack. 2. Further Analysis of the Pain Mechanism in Headache. Robert M. Marcussen and Harold G. Wolff. Pp. 42–51.. Psychoanalytic Quarterly 20:333