MARINOV, Rumen. CONTEMPORARY CHALLENGES TO THE PROTECTION OF THE COUNTRY’S SOVEREIGNTY. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 4, p. 168–172, 2024. DOI: 10.17770/etr2024vol4.8187. Disponível em: https://journals.ru.lv/index.php/ETR/article/view/8187.. Acesso em: 30 jun. 2024.