Bommalingappa, M, 2016. BUTORPHANOL AS AN ADJUVANT TO LEVOBUPIVACAINE IN SUPRACLAVICULAR BRACHIAL PLEXUS BLOCK FOR UPPER LIMB ORTHOPAEDIC SURGERIES: A RANDOMIZED, DOUBLE BLIND, PLACEBOCONTROLLED STUDY.. https://doi.org/10.14260/jemds/2016/957