Comparison of perfusion index (PI) with other non-invasive hemodynamic monitors of stress response following endotracheal intubation. International Journal of Biomedical Research, [S. l.], v. 7, n. 7, p. 490–494, 2016. DOI: 10.7439/ijbr.v7i7.3462. Disponível em: https://ssjournals.co.in/index.php/ijbr/article/view/3462. Acesso em: 4 apr. 2026.