СМИРНОВА, Маргарита. ЭКОЛОГИЯ ЧЕЛОВЕКА И ЭКОЛОГИЧЕСКОЕ ОБРАЗОВАНИЕ. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 194–196, 1999. DOI: 10.17770/etr1999vol1.1876. Disponível em: https://journals.ru.lv/index.php/ETR/article/view/1876.. Acesso em: 3 may. 2024.