Yadav, R.; Sah, B.; Kumar, P.; Singh, S. Effectiveness of Addition of Neostigmine or Dexamethasone to Local Anaesthetic in Providing Perioperative Analgesia for Brachial Plexus Block: A Prospective, Randomized, Double Blinded, Controlled Study. Kathmandu Univ. Med. J. 2009, 6, 302-309.