References
- Bonica JJ. Introduction, In: Alling CC, ed. Facial pain. 3rd ed. Philadelphia: Lea & Febiger. 1968: 1
- Ogden ND. The treatment of allergic headaches, Ann Allergy 1951: 9: 673
- Wolff HG. Wolf S. Pain. 2nd ed. Springfield, IL: CC Thomas. 1958: 42
- Graham JR. Profile in headaches. Med Sci 1960: (Nov 25): 647–75