E. U. Ahmed, “Comparative Study Between Metronidazole, Amoxycilin, Omeprazole Based Therapy and Levofloxacin, Amoxycilin, Omeprazole Based Therapy for Helicobactor Pylori Eradication in Peptic Ulcer Disease”, J Chittagong Med Coll Teachers Ass, vol. 20, no. 2, pp. 29–32, Jul. 2010.