Shrestha, S., and A. K. Adhikari. “Comparison of Maximum Phonation Duration and S/Z Ratio in Individuals With Asthma, Tuberculosis and Clinically Normal Voice”. Medical Journal of Shree Birendra Hospital, vol. 18, no. 2, July 2019, pp. 16-21, doi:10.3126/mjsbh.v18i2.24089.