Spectrophotometric Determination of Lanthanum (III) With Bromopyrogallol Red And Cetylpridinium Chloride -Applications in Natural Waters and Urine. Journal of Pharmaceutical Negative Results, [S. l.], p. 3117–3125, 2022. DOI: 10.47750/pnr.2022.13.S06.421. Disponível em: https://mail.pnrjournal.com/index.php/home/article/view/2468.. Acesso em: 13 jun. 2026.