Jakab, N. and Solymosi-Szekeres, B. (2023) “The Theoretical Issue of Social Security—International and European Perspectives”, in Jakab, N. (ed.) Sustainability Of The Social Security System: Demographic Challenges and Answers in Central Europe. Legal Studies on Central Europe, pp. 19–50. doi:10.54171/2023.nj.sotsss_2.