S. Behdad, V. Ayatollahi, H. Harrazi, N. Nazemian, N. Heiranizadeh, and B. Baghianimoghadam, “Remifentanil at induction of general anesthesia for cesarean section: Double blind, randomized clinical trial”, Colomb Med, vol. 44, no. 2, pp. 87–91, May 2013.