Величков, Н. (2021) „Dynamics and Macroeconomic Interaction of Government Expenditure in BELL and PIIGS: A Comparative Analysis“, Научни трудове, (4), стр. 119–128. достъпен на: https://yb.e-dnrs.org/index.php/rp/article/view/5263 (отворен на: 22 Юли 2026).