Initial Study for Cerium and Lanthanum Extraction from Bangka Tin Slag through NaOH and HClO4 LeachingBadrul Munir, Sulaksana Permana, Anggita Amilia, Ahmad Maksum and Johny W SoedarsonoMATEC Web Conf., 269 (2019) 07003DOI: https://doi.org/10.1051/matecconf/201926907003