A., Thangavel, and Vairamuthu G. S. “Study on Peak Expiratory Flow Rate in School Children from Madurai District, Tamil Nadu, India”. International Journal of Contemporary Pediatrics 6, no. 4 (June 27, 2019): 1421–1427. Accessed May 21, 2025. https://www.ijpediatrics.com/index.php/ijcp/article/view/2559.