ARORA, R.; RAHMAN, S. A.; DEWAN, P. J.; AGARWAL, A. A comparative study of fentanyl and tramadol as adjuvants to intrathecal hyperbaric bupivacaine 0.5% in caesarean deliveries. International journal of health sciences, [S. l.], v. 6, n. S5, p. 7708–7720, 2022. DOI: 10.53730/ijhs.v6nS5.10436. Disponível em: https://sciencescholar.us/journal/index.php/ijhs/article/view/10436. Acesso em: 17 jul. 2025.