URL
http://chipsfs.chonnam.ac.kr/cnuo/635297.pdf
http://chipsfs.chonnam.ac.kr/cnuo/635298.pdf
http://chipsfs.chonnam.ac.kr/cnuo/635299.pdf
http://chipsfs.chonnam.ac.kr/cnuo/635788.pdf
http://chipsfs.chonnam.ac.kr/cnuo/635789.pdf
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