GRITSOVA, Olga A.; TISSEN, Elena V. Quality Assessment of Online Learning in Regional Higher Education Systems. Economy of Regions, [S. l.], v. 17, n. 3, p. 929–943, 2021. DOI: 10.17059/ekon.reg.2021-3-15. Disponível em: https://economyofregions.org/ojs/index.php/er/article/view/1585. Acesso em: 4 apr. 2026.