Bunnakkha, Chudhalak, and Charkorn Jarupisitthorn. “Extraction of Tin from Hardhead by Oxidation and Fusion With Sodium Hydroxide”. Journal of Metals, Materials and Minerals 22, no. 1 (June 30, 2012). Accessed April 19, 2024. https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/16.