CHERNYAVSKA, G. . Procedural Legal Norms in the Sphere of Social Security. Przegląd Prawno-Ekonomiczny, [S. l.], n. 28 (3), p. 54–63, 2014. Disponível em: https://czasopisma.kul.pl/index.php/ppe/article/view/15779. Acesso em: 19 maj. 2025.