URL
http://chipsfs.chonnam.ac.kr/cnuo/100057.pdf
http://chipsfs.chonnam.ac.kr/cnuo/100058.pdf
http://chipsfs.chonnam.ac.kr/cnuo/100059.pdf
http://chipsfs.chonnam.ac.kr/cnuo/100060.pdf
http://chipsfs.chonnam.ac.kr/cnuo/100061.pdf
http://chipsfs.chonnam.ac.kr/cnuo/100062.pdf
http://chipsfs.chonnam.ac.kr/cnuo/100063.pdf
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