OTSMAA, Merle. Mining under kalina and Selisoo Bogs. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 175–181, 2015. DOI: 10.17770/etr2013vol1.822. Disponível em: https://journals.rta.lv/index.php/ETR/article/view/822.. Acesso em: 4 may. 2024.