Ibáñez, S., y J. M. Suñé. «Experimental Study of PH in Dispersed Systems of Pharmaceutical Interest: I. Material, Methods Used and Orientation Tests». Ars Pharmaceutica (Internet), vol. 11, n.º 3-4, febrero de 1970, pp. 111-22, https://revistaseug.ugr.es/index.php/ars/article/view/9705.