Mir, T. A.; Mir, A. H.; Gani, T. T.; Yousuf, A.; Ahmad, S. I. Evaluation of Efficacy of Bupivacaine and Bupivacaine Plus Clonidine in Transversus Abdominis Plane (TAP) Block for Postoperative Analgesia: A Prospective, Randomized, Double Blind, Comparative Study. Int J Res Med Sci 2017, 5, 4588-4594.