Akhter, Qazi Farzana, Qazi Shamima Akhter, Farhana Rahman, Sybilla Ferdousi, and Susmita Sinha. “Power Spectral Analysis of Heart Rate Variability in Bangladeshi Healthy Male and Female”. Bangladesh Medical Journal 43, no. 3 (January 7, 2016): 146–150. Accessed January 17, 2022. https://banglajol.info/index.php/BMJ/article/view/26298.