Single contribution to the compulsory state social insurance: features, trends and problems. World of finance, [S. l.], n. 4(53), p. 24–34, 2019. DOI: 10.35774/sf2017.04.024. Disponível em: http://sf.wunu.edu.ua/index.php/wof/article/view/1146. Acesso em: 5 dec. 2025.