URL
http://chipsfs.chonnam.ac.kr/cnuo/631034.pdf
http://chipsfs.chonnam.ac.kr/cnuo/631035.pdf
http://chipsfs.chonnam.ac.kr/cnuo/631036.pdf
http://chipsfs.chonnam.ac.kr/cnuo/631037.pdf
http://chipsfs.chonnam.ac.kr/cnuo/191685.pdf
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