Bommalingappaand M. BUTORPHANOL AS AN ADJUVANT TO LEVOBUPIVACAINE IN SUPRACLAVICULAR BRACHIAL PLEXUS BLOCK FOR UPPER LIMB ORTHOPAEDIC SURGERIES: A RANDOMIZED, DOUBLE BLIND, PLACEBOCONTROLLED STUDY. no. 60, Akshantala Enterprises Private Limited, July 2016, doi:10.14260/jemds/2016/957.