Maar, Juergen Heinrich. “Almost a Discovery – Henri Gorceix, the Mining School of Ouro Preto, the Monazite Sand of Bahia and the Chemistry of Didymium”. Substantia 2, no. 2 (September 24, 2018): 27–41. Accessed May 21, 2026. https://riviste.fupress.net/index.php/subs/article/view/59.