Parera, A., y J. M. Suñé. «Pharmacotechnical Study of Fatty Esters of Polyethylene Glycols. I.- Introduction, Techniques Used and Determination of the Incorporation of Water to Binary Mixtures Petrolatum-Emulsifier». Ars Pharmaceutica (Internet), vol. 11, n.º 11-12, octubre de 1970, pp. 475-00, https://revistaseug.ugr.es/index.php/ars/article/view/9742.