Chʻang-sŏk Pak

1968

• Chiyŏk hwanʼgyŏng pojŏn ŭl wihan hwanʼgyŏng kyehoek kwa hwanʼgyŏng pʻyŏngka ŭi yŏnʼgye pangan yŏnʼgu
• Tosi saengtʻae netʻŭwŏkʻŭ kuchʻuk ŭl wihan tʻoji iyong kyehoek yŏnʼgu