Tajul Ariffin Masron, and Zulkornain Yusop. 2006. “Optimum Currency Area Criteria and Volatility in ASEAN”. Asian Academy of Management Journal of Accounting and Finance 2 (2): 1–17. https://ejournal.usm.my/aamjaf/article/view/aamjaf_vol2-no2-2006_1.