R. Ferraz in A. Portugal Duarte, „Economic Growth and Public Indebtedness in the Last Four Decades: Is Portugal different from the other PIIGS’ economies?“, OE, let. 61, št. 6, str. 3–11, jul. 2015, Pridobljeno: 24. november 2025. [Na spletu]. Dostopno na: https://old.journals.um.si/index.php/oe/article/view/2245