Величков, Николай. „Dynamics and Macroeconomic Interaction of Government Expenditure in BELL and PIIGS: A Comparative Analysis“. Научни трудове, no. 4 (Октомври 4, 2021): 119–128. отворен на Юли 22, 2026. https://bjiep.e-dnrs.org/index.php/rp/article/view/5263.