INFLUENCE OF PURIFICATION PROCESS ON THE CHARACTERISTICS OF ROMANIAN CALCIUM BENTONITE. Journal of Engineering Studies and Research, [S. l.], v. 22, n. 1, p. 32–37, 2016. DOI: 10.29081/jesr.v22i1.120. Disponível em: https://jesr.ub.ro/journal/article/view/120. Acesso em: 13 sep. 2025.