[1]
J. M. Costa-Martins, C. C. Dias, M. Pereira, and J. Tavares, “Effects of Local Anesthetic on the Time Between Analgesic Boluses and the Duration of Labor in Patient-Controlled Epidural Analgesia: Prospective Study of Two Ultra-Low Dose Regimens of Ropivacaine and Sufentanil”, Acta Med Port, vol. 28, no. 1, pp. 70–76, Feb. 2015.