IEFYMENKO, T.; SOKOLOVSKA, A.; RAINOVA, L. Reforms of Social Security Contributions in Selected EU Member States and Ukraine: Peculiarities of Implementation and Consequences. Science and Innovation, Ukraine, v. 17, n. 6, p. 24–40, 2021. DOI: 10.15407/scine17.06.024. Disponível em: https://scinn-eng.org.ua/ojs/index.php/ni/article/view/231. Acesso em: 20 apr. 2026.