Ali, M., D. Sur, A. L. Lopez, S. Kanungo, R. L. Ochiai, B. Manna, D. R. Kim, J. Deen, S. K. Bhattacharya, and J. D. Clemens. “Community Participation in Two Vaccination Trials in Slums of Kolkata, India: A Multi-Level Analysis”. Journal of Health, Population and Nutrition, vol. 28, no. 5, Sept. 2010, pp. 450-7, doi:10.3329/jhpn.v28i5.6153.