SALAS, E., M. L. Gómez-Rodriguez, G. CROVETTO, C. . LÓPEZ-MARTÍNEZ, J. GARCÍA-FRASQUET, and J. THOMAS. “Quantification Method of Secondary Amines through the Formation of Heavy Metal Ditiocarbamates in Mixtures Dioxane-Water”. Ars Pharmaceutica (Internet), vol. 37, no. 3, Sept. 1996, pp. 569-74, https://revistaseug.ugr.es/index.php/ars/article/view/21798.