Castillo, A., and J.Mª. Suñé. 1968. “Hydrophilicity of Ointment-Absorbing Excipients (excipients A / O). II. Water Index of Vaslin-Emulsifier Mixtures”. Ars Pharmaceutica (Internet) 9 (7-10):309-25. https://revistaseug.ugr.es/index.php/ars/article/view/7787.