1. Headache and Head Pain;Wolff,1963
2. Muscular contraction: A psychiatric review;Martin,1967
3. Migraine and tension headaches: A clinical study of 2000 cases;Friedman;Neurol.,1964
4. Psychological study of the migraine syndrome;Selinsky;Bull. N.Y. Med.,1939
5. The Common Headache Syndromes;Ostfeld,1962