Chakraborty, B. et al. 2011. Persistence of Anti-HBs Antibody and Immunological Memory in Healthy Individuals Vaccinated with Hepatitis B Vaccine. Stamford Journal of Microbiology. 1, 1 (Dec. 2011), 37–41. DOI:https://doi.org/10.3329/sjm.v1i1.9101.