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: jul. 21, 2026. Dostopno na: https://journals.um.si/index.php/oe/article/view/2328