NI’MAH, Y. L.; HERNANDA, R. A.; SUPRAPTO, S. Nickel Extraction from Kolaka Laterite Ore: A HCl Leaching Optimization Method Using the BBD-RSM and Recovery via Oxalate Precipitation. Engineering, Technology & Applied Science Research, Greece, v. 16, n. 1, p. 31795–31801, 2026. DOI: 10.48084/etasr.15251. Disponível em: https://etasr.com/index.php/ETASR/article/view/15251. Acesso em: 21 apr. 2026.