Tafur, Luis Alberto, Ana Milena Serna, and Eduardo Lema. “Phentanyl PK PD, a Valid Drug”. Colombian Journal of Anesthesiology 38, no. 1 (January 1, 2010): 68–83. Accessed May 19, 2024. https://www.revcolanest.com.co/index.php/rca/article/view/311.