ZELENKOVA, Anna. STARPTAUTISKĀS DABAS AIZSARDZĪBAS ORGANIZĀCIJAS. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 242–247, 1999. DOI: 10.17770/etr1999vol1.1866. Disponível em: https://journals.ru.lv/index.php/ETR/article/view/1866.. Acesso em: 23 nov. 2024.