NOVIKS, Gotfrids. System Analysis in the Environmental Science. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 120–129, 2015. DOI: 10.17770/etr2011vol1.911. Disponível em: https://journals.ru.lv/index.php/ETR/article/view/911.. Acesso em: 23 nov. 2024.