JIARAWATTANANON, M.; WASANAPIARNPONG, T.; MONGKOLKACHIT, C. Utilization of lignite ash as raw materials for ceramic tile. Journal of Metals, Materials and Minerals, Bangkok, Thailand, v. 29, n. 4, 2019. Disponível em: http://jmmm.material.chula.ac.th/index.php/jmmm/article/view/475. Acesso em: 27 nov. 2021.