Ramachandra, K., S. Srinivasaiah, S. Giliyaru, and A. Eregowda. “Study of PEFR in Urban Lower and Middle Class High School Children at Bangalore, India”. International Journal of Contemporary Pediatrics, vol. 3, no. 1, Dec. 2016, pp. 189-92, doi:10.18203/2349-3291.ijcp20160157.