V. Singh, V. Kurrey, O. Khandwal, and S. Phuljhele, “Evaluation of Lung Function by Spirometry in 12-14 yrs Adolescents in schools of Raipur city Chhattisgarh”, Int. J. Medi. Sci. Res. Practi., vol. 1, no. 1, pp. 9–15, May 2014.