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OA paper journal is called open source paper journal, referred to as OA (Open Access), and is a free online journal. It refers to putting academic information resources on the Internet so that anyone can obtain the resources for free without considering copyright or registration restrictions. It aims to allow all users to have unrestricted access to the full text of journal articles through the Internet; in terms of paper quality control , OA journals are similar to traditional journals and adopt a strict peer review system.