NOVIKS, Gotfrids. Investigation of Biomass Ash Properties for Their Utilization Assesment. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 168–174, 2015. DOI: 10.17770/etr2013vol1.821. Disponível em: https://journals.ru.lv/index.php/ETR/article/view/821.. Acesso em: 8 may. 2024.