1. Corticosteroid infiltation of the extradural space;Barry;Ann. Phys. Med.,1962
2. Chronic pain: A review for the family physician;Bergman;J. Family Pract.,1978
3. The management of pain with nerve blocks;Black;Minn. Med.,1974
4. The chronic pain syndrome;Black;Surg. Clin. North Am.,1975
5. The chronic pain syndrome;Black;Clin. Med.,1975