Singh, J., K. K. Gupta, D. Himanshu, A. Dinkar, V. Atam, and S. Kant. “To Study the Effect of Glycemic Control and Duration of Disease on Pulmonary Function Tests and Diffusion Capacity in Type 2 Diabetes Mellitus”. International Journal of Research in Medical Sciences, vol. 3, no. 1, Jan. 2017, pp. 224-8, https://www.msjonline.org/index.php/ijrms/article/view/1239.