Nayem, Mohammad, Noorzahan Begum, and Sultana Ferdousi. 2013. “Time Domain Measures of Heart Rate Variability to Assess Autonomic Dysfunction In Irritable Bowel Syndrome”. Journal of Bangladesh Society of Physiologist 7 (2):60-65. https://doi.org/10.3329/jbsp.v7i2.14451.