Singh, B., Pandey, N. M., Garg, R. K., Kohli, N., Usman, K., Agarwal, G. G., & Tiwari, S. C. (2019). Sample attrition rate of a community study: An analysis of Lucknow urban and rural elderly follow-up over a period of 9 years. Indian J Psychiatry.

Singh, Bhupendra, Nisha Mani Pandey, R. K. Garg, Neera Kohli, Kausar Usman, G. G. Agarwal, e Sarvada Chandra Tiwari. "Sample Attrition Rate of a Community Study: An Analysis of Lucknow Urban and Rural Elderly Follow-up Over a Period of 9 Years." Indian J Psychiatry 2019.

Singh, Bhupendra, et al. "Sample Attrition Rate of a Community Study: An Analysis of Lucknow Urban and Rural Elderly Follow-up Over a Period of 9 Years." Indian J Psychiatry 2019.