Magrì, Carlotta, et al. “Two Strategies of Morphine Administration on the Control of Post-Surgical Pain After Anesthesia With Remifentanil”. Annali Italiani Di Chirurgia, vol. 81, no. 3, May 2010, pp. 205-9, https://annaliitalianidichirurgia.it/index.php/aic/article/view/2667.