PETROVA, Desislava. Innovation , Business , Education – Regional , National and European Policies 2020. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 3, p. 50–56, 2015. DOI: 10.17770/etr2013vol3.879. Disponível em: https://journals.rta.lv/index.php/ETR/article/view/879.. Acesso em: 30 apr. 2024.