Islam, M. M.; Ali, N. P.; Begum, R.; Akhtaruzzaman, A. Subarachnoid Clonidine or Fentanyl With Low Dose Hyperbaric Bupivacaine for Elective Caesarean Section - A Comparative Study. J. Dhaka Natl. Med. Coll. Hosp. 2012, 17, 14-17.