Shahane, N., and M. P. Jiandani. “Correlation of Peak Cough Flow Rate With Peak Expiratory Flow Rate In Patients With Chronic Respiratory Diseases”. National Journal of Integrated Research in Medicine, vol. 9, no. 3, July 2018, pp. 21-25, http://nicpd.ac.in/ojs-/index.php/njirm/article/view/2346.