Capitán, F. and Román, M. (1967) “Analytical applications of anthragalol and anthrapurpurine. III.- Spectrophotometric determination of Th (IV) with anthrapurpurine”, Ars Pharmaceutica (Internet), 8(7-10), pp. 399–404. Available at: https://revistaseug.ugr.es/index.php/ars/article/view/7681 (Accessed: 2 April 2025).