URL
http://chipsfs.chonnam.ac.kr/cnuo/639633.pdf
http://chipsfs.chonnam.ac.kr/cnuo/639634.pdf
http://chipsfs.chonnam.ac.kr/cnuo/639635.pdf
http://chipsfs.chonnam.ac.kr/cnuo/639636.pdf
http://chipsfs.chonnam.ac.kr/cnuo/639637.pdf
http://chipsfs.chonnam.ac.kr/cnuo/639638.pdf
http://chipsfs.chonnam.ac.kr/cnuo/639639.pdf
http://chipsfs.chonnam.ac.kr/cnuo/639640.pdf
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