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https://www.sciencetimes.co.kr/news/%ec%9e%84%ec%8b%a0-%ec%97%ac%ec%84%b1%ec%9d%98-%eb%87%8c%ec%a1%b0%ec%a7%81%ec%9d%80-%eb%a7%a4%ec%9a%b0-%eb%8b%a4%eb%a5%b4%eb%8b%a4/
https://m.yna.co.kr/view/AKR20161220056000009
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https://www.sciencetimes.co.kr/news/%ec%9e%84%ec%8b%a0-%ec%97%ac%ec%84%b1%ec%9d%98-%eb%87%8c%ec%a1%b0%ec%a7%81%ec%9d%80-%eb%a7%a4%ec%9a%b0-%eb%8b%a4%eb%a5%b4%eb%8b%a4/
https://m.yna.co.kr/view/AKR20161220056000009
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