Nadiya Kazakova and Heorhii Petrov 2023. Default risk and fiscal sustainability in PIIGS countries. The Journal of V. N. Karazin Kharkiv National University. Series: International Relations. Economics. Country Studies. Tourism. 17 (Jun. 2023), 31-41. DOI:https://doi.org/10.26565/2310-9513-2023-17-03.