Nadiya Kazakova, and Heorhii Petrov. “Default Risk and Fiscal Sustainability in PIIGS Countries”. The Journal of V. N. Karazin Kharkiv National University. Series: International Relations. Economics. Country Studies. Tourism, no. 17 (June 30, 2023): 31-41. Accessed July 25, 2024. https://periodicals.karazin.ua/irtb/article/view/22038.