SMRITIKANA BISWAS, et al. “IDENTIFICATION OF CagA HARBORING HELICOBACTER PYLORI FROM BUCCAL SWAB COLLECTED FROM TOBACCO ADDICTED WOMEN SUBJECTS”. International Journal of Pharma and Bio Sciences, vol. 4, no. 2, June 2013, pp. 165-7, https://ijpbs.net/index.php/journal/article/view/2283.