1. Köller C. History of cocaine as a local anesthetic. JAMA 1941;117:1284–1285.
2. Halsted WS. Surgical papers. In: Burket WC, ed. 1st ed. Baltimore: Johns Hopkins Press; 1925.
3. Hirschel G. Anasthesierung des plexus brachialis bei Operationen an der oberen extremitat. Muenchener Medizinische Wochenschrift 1911;58:1555–1556.
4. Kulenkampff D. Anesthesia of the brachial plexus [German]. Zentralb Chir 1911;38:1337–1340.
5. Ting PL, Sivagnanratnam V. Ultrasonographic study of the spread of local anesthetic during axillary brachial plexus block. Br J Anaesth 1989;63:326–329.