KHAYRULLINA, Y. R. Middle class in the Republic of Tatarstan: Analysis of the results of sociological research. Revista San Gregorio, [S. l.], v. 1, n. 25, 2018. DOI: 10.36097/rsan.v1i25.756. Disponível em: http://revista.sangregorio.edu.ec/index.php/REVISTASANGREGORIO/article/view/756. Acesso em: 2 may. 2024.