"Chŏng Kwang-sŏk" . "정광석" . "정 광석" . . . "Kwang-sŏk Chŏng"@en . "정광석" . "정 광석" . . "Kwang-sŏk"@en . "정 광석" . "Chŏng"@en . "Chŏng Kwang-sŏk" . "정광석" . . .