JAWAD, Shawket K.; MUSLIM, Nadia M. Liquid Ion Exchange for Extraction and Spectrophotometric Determination of Tungestate WO4Ë­ by Use Azo-derivative. Journal of Kufa for Chemical Sciences, Kufa, Najaf, IRAQ, n. 10, 2016. Disponível em: https://journal.uokufa.edu.iq/index.php/jkcs/article/view/3397. Acesso em: 1 nov. 2026.