URL
http://chipsfs.chonnam.ac.kr/cnuo/99796.pdf
http://chipsfs.chonnam.ac.kr/cnuo/99797.pdf
http://chipsfs.chonnam.ac.kr/cnuo/99798.pdf
http://chipsfs.chonnam.ac.kr/cnuo/99799.pdf
http://chipsfs.chonnam.ac.kr/cnuo/99800.pdf
http://chipsfs.chonnam.ac.kr/cnuo/99801.pdf
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