Lakshmi , S. Kalyani Surya Dhana, Ananya Nanda, and Vandana Pakhare. “Impact of Heart Rate Variability on Anesthesia, Critical Care and Pain”. New Advances in Medicine and Medical Science Vol. 3 (June 1, 2023): 150–165. Accessed June 4, 2026. https://stm.bookpi.org/NAMMS-V3/article/view/10782.