Mathew, A. C., T. Prince, R. Remees, N. Saravanapandian, S. Ramalingam, K. Srikanth, and J. Mathai. “Prevalence and Risk Factors of Asthma in School Going Children in South India”. Nepal Journal of Epidemiology, vol. 2, no. 1, Mar. 2012, pp. 171-8, doi:10.3126/nje.v2i1.6378.