I. . Patel, R. Ghandhi, A. . Shah, M. . Bhatt, and A. . Suthar, “COMPARATIVE STUDY OF BUPIVACAINE VS BUPIVACAINE AND KETAMINE (INTRATHECALLY) DURING INTRAOPERATIVE AND POST OPERATIVE ANALGESIA IN NON PIH CAESARIAN SECTION”, Natl J Med Res, vol. 1, no. 02, pp. 71–75, Dec. 2011.