Islam, M., S. Rahman, S. Shamsuzzaman, N. Muazzam, S. Kibria, M. Hossain, N. Ahmed, A. Sarkar, and S. Nahar. “A Comparative Study Among Different Invasive Methods For The Diagnosis Of Helicobacter Pylori”. Faridpur Medical College Journal, vol. 5, no. 1, Jan. 2011, pp. 21-24, doi:10.3329/fmcj.v5i1.6809.