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  1.  3
    Yi I, Yulgok chŏnsŏ.Suk-pʻil Chang - 1999 - Ulsan-si: Ulsan Taehakkyo Chʻulpʻanbu.
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  2.  8
    Yŏhŏnhak ŭi ihae: Yŏhŏn Chang Hyŏn-gwang ŭi hangmun kwa sasang.Suk-pʻil Chang (ed.) - 2015 - Sŏul-si: Yemun Sŏwŏn.
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  3. Yulgok Yi I ŭi sŏnghak yŏnʼgu.Suk-pʻil Chang - 1992 - [Seoul]: Koryŏ Taehakkyo Minjok Munhwa Yŏnʼguso.
     
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