D. B. Kusuma, S. Ashif, A. M. Harahap, and M. Omarsyah, “THE ROLE OF ASEAN EXCHANGE RATE UNIT (AERU) FOR ASEAN-5 MONETARY INTEGRATION: AN OPTIMUM CURRENCY AREA CRITERIA”, bemp, vol. 15, no. 3, pp. 55-82, Mar. 2013.