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  1.  3
    Hong Tae-yong: Chosŏn sidae chʻoego ŭi kwahak sasangga.In-gyu Kim - 2008 - Sŏul Tʻŭkpyŏlsi: Sŏnggyunʼgwan Taehakkyo Chʻulpʻanbu.
  2.  2
    북학 사상 의 철학적 기반 과 근대적 성격.In-gyu Kim - 2000 - Sŏul:
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    Pukhak sasang ŭi chʻŏrhakchŏk kiban kwa kŭndaejŏk sŏngkyŏk.In-gyu Kim - 2000 - Sŏul: Taun Saem.
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  4.  2
    Pukhak sasang yŏn'gu.In-gyu Kim - 2017 - Sŏul-si: Simsan.
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