Mitchell R. Accessory Rare Earth. Strontium, Barium and Zirconium Minerals in the Benfontein and Wesselton Calcite Kimberlites. IKC abstracts [Internet]. 1991 Feb. 1 [cited 2025 Jan. 18];5:292-4. Available from: https://journals.library.ualberta.ca/ikcabstracts.com/index.php/ikc/article/view/2544