VALKOV, Vladimir. THE ROLE OF THE DEMOGRAPHIC FACTOR AS PART OF THE SOCIAL SECURITY SYSTEM. KNOWLEDGE - International Journal , [S. l.], v. 47, n. 5, p. 913–918, 2021. Disponível em: https://ikm.mk/ojs/index.php/kij/article/view/4874. Acesso em: 16 jul. 2024.