Study of efficacy, safety and cardiotocographic changes during epidural analgesia with ropivacaine in labour. International Journal of Biomedical and Advance Research, [S. l.], v. 4, n. 12, p. 896–901, 2013. DOI: 10.7439/ijbar.v4i12.598. Disponível em: https://ssjournals.co.in/index.php/ijbar/article/view/422. Acesso em: 13 aug. 2025.