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  1.  9
    Hanʼguk sasangga ŭi saeroun palgyŏn.Yong-gŏl Kim (ed.) - 1993 - Kyŏnggi-do Sŏngnam-si: Hanʼguk Chŏngsin Munhwa Yŏnʼguwŏn.
    [1]. Pyŏngwa Yi Hyŏng-sang, Hosan Pak Mun-ho yŏnʼgu -- 2. Cho Ik yŏnʼgu -- 3. Kwak Chong-sŏk yŏnʼgu.
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  2.  9
    Sŏngho Yi Ik ŭi chʻŏrhak sasang yŏnʼgu.Yong-gŏl Kim - 1989 - [Seoul]: Sŏnggyunʼgwan Taehakkyo Chʻulpʻanbu.
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  3. Yi Ik sasang ŭi kujo wa sahoe kaehyŏngnon.Yong-gŏl Kim - 2004 - Sŏul: Sŏul Taehakkyo Chʻulpʻanbu. Edited by Yong-gŏl Kim.
     
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