https://geo.cnu.ac.kr/2017/08/31/%ec%9e%a5%ec%b0%ac%eb%8f%99-%ea%b5%90%ec%88%98-google-scholar-%ec%84%a0%ec%a0%95-%ec%84%9d%ec%9c%a0%c2%b7-%ea%b0%80%ec%8a%a4-%eb%b6%84%ec%95%bc-%eb%85%bc%eb%ac%b8-%ec%9d%b8%ec%9a%a9%ed%9a%9f/