NADDONI, D. B.; BALAKUNDI, S. K.; ASSAINAR, K. K. The effect of nitrous oxide (entonox) on labour. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 5, n. 3, p. 835–839, 2017. DOI: 10.18203/2320-1770.ijrcog20160594. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/778. Acesso em: 13 oct. 2025.