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คุ้มราษฎร์ ส. Attach Certificate of Origin, utilizing FTA privilege: Case Study: Thailand’s gems and jewelry Industry under ASEAN Trade in Goods Agreement (ATIGA). bus. rev. j. [internet]. 2018 Dec. 24 [cited 2026 Oct. 14];10(2):281-98. available from: https://so01.tci-thaijo.org/index.php/bahcuojs/article/view/162359