Srivastava, S., and D. Agarwal. “Correlates of Peak Expiratory Flow Rate and Deriving the Prediction Equation in School Going Children of Lucknow”. International Journal Of Community Medicine And Public Health, vol. 4, no. 10, Sept. 2017, pp. 3550-3, doi:10.18203/2394-6040.ijcmph20174096.