P. K. Mohanty, J. Chavda, M. S. Pillai, D. M. Sharma, and S. Charki, “Early detection and management of critically sick newborn in neonatal intensivecare unit using perfusion index and pleth variability index in advanced pulse oximetry”, Indian J Child Health, vol. 1, no. 3, pp. 158–159, Oct. 2014, doi: 10.32677/IJCH.2014.v01.i03.016.