MD, T.-H., S. BA, A. MD, J. MD, and G. Rajan, MD, MBBS, FAACD, FASA. “Heart Rate Variation Is The Clinical Sign Associated With The Deepest Plane of Anesthesia During Induction: The Novel Finding and Its Clinical Implications”. Anaesthesia, Pain & Intensive Care, Vol. 27, no. 2, Apr. 2023, pp. 243-9, doi:10.35975/apic.v27i2.1930.