V. . Dizdarević in R. Volčjak, „Convergence of Business Cycles as A Confirmation of Oca Theory“, OE, let. 58, št. 3-4, str. 3–15, avg. 2012, Pridobljeno: 24. november 2025. [Na spletu]. Dostopno na: https://old.journals.um.si/index.php/oe/article/view/2328