VALKOV, Vladimir. IMPACT OF THE ECONOMIC FACTOR ON THE SOCIAL SECURITY SYSTEM. KNOWLEDGE - International Journal , [S. l.], v. 47, n. 1, p. 213–218, 2021. DOI: 10.35120/kij4701213v. Disponível em: https://ojs.ikm.mk/index.php/kij/article/view/4667. Acesso em: 8 oct. 2026.