Moyao-García, D., J. C. Hernández-Palacios, J. C. Ramìrez-Mora, and A. A. Nova-Ocampo. 2009. “A Pilot Study of Nalbuphine Versus Tramadol Administered Bycontinuous Intravenous Infusion for Postoperative Pain Control Inchildren”. Acta Biomedica Atenei Parmensis 80 (2): 124-30. https://mattioli1885journals.com/index.php/actabiomedica/article/view/1207.