Richards, MD, PhD, P., D. Riff, MD, R. Kelen, RN, and W. Stern, PhD. “Analgesic and Adverse Effects of a Fixed-Ratio Morphine-Oxycodone Combination (MoxDuo®) in the Treatment of Postoperative Pain”. Journal of Opioid Management, vol. 7, no. 3, Jan. 2018, pp. 217-28, doi:10.5055/jom.2011.0064.