• https://scholar.korea.ac.kr/handle/2021.sw.korea/190537
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• https://scholar.korea.ac.kr/handle/2021.sw.korea/190539
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• https://scholar.korea.ac.kr/handle/2021.sw.korea/190546
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• https://scholar.korea.ac.kr/handle/2021.sw.korea/190548
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• https://scholar.korea.ac.kr/handle/2021.sw.korea/190751
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