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Yang, Cheol-Kwan; Shim, Duk-Sun
Shim, Duk-Sun; Yang, Cheol-Kwan; Kim, Jae Hwan; Han, Joo Pyo; Cho, Yong Soo
Shim, Duk-Sun; Yang, Cheol-Kwan
Chang, Samuel H.; Shim, Duk-Sun; Yang, Cheol-Kwan