Cabarique, Sergio, Ricardo Nates, and Jesús Zapata. 2005. “Intrathecal Anesthesia for Cesarean Section: Low Doses of Heavy Levobupivacaine Plus Fentanyl”. Journal of Medicine and Surgery Repertoire 14 (4):175-80. https://doi.org/10.31260/RepertMedCir.v14.n4.2005.403.