KUPRAVA CLAY DEPOSIT RESEARCH COMPARISON. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, [S. l.], v. 1, p. 236–240, 2019. DOI: 10.17770/etr2019vol1.4164. Disponível em: https://archive-journals.rtu.lv/etr/article/view/4217.. Acesso em: 11 mar. 2026.