A.Mohanarathinam, Kamalraj Subramaniam, N.B.Prakash, G.R.Hemalakshmi, G.K.D.Prasanna Venkatesan. “Breathe Analyser for Respiratory Diseases: A Review”. International Journal of Advanced Science and Technology, Vol. 29, no. 3, Apr. 2020, pp. 8284 -89, http://sersc.org/journals/index.php/IJAST/article/view/9086.