Ferdousi, S., M. Ferdous, and M. S. Islam. “Impact of Smoking Status on Autonomic Functions Assessed by Spectral Analysis of Heart Rate Variability”. International Journal of Clinical and Experimental Physiology, Vol. 1, no. 1, Jan. 2014, pp. 57-62, https://ijcep.org/index.php/ijcep/article/view/48.