SINGH, K. N.; TAMTA, N. A study to assess efficacy of lower dose ketamine in labor analgesia and its effect on maternal and perinatal outcome. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 7, n. 11, p. 4521–4524, 2018. DOI: 10.18203/2320-1770.ijrcog20184500. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/5270. Acesso em: 14 oct. 2025.