Hyung-chan Kim (2003). «Kim Jong Il's North Korea and Its Survivability». Korea and World Affairs (Korea: Pʻyŏnghwa Tʻongil Yŏnʼguso) 27: 251. ISSN0251-3072. OCLC3860590. «One also has to accept the existence of Kim Bo-hyeon (1871–1955), Kim Il-sung's grandfather, who participated in anti-Japanese activities.»
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Hyung-chan Kim (2003). «Kim Jong Il's North Korea and Its Survivability». Korea and World Affairs (Korea: Pʻyŏnghwa Tʻongil Yŏnʼguso) 27: 251. ISSN0251-3072. OCLC3860590. «One also has to accept the existence of Kim Bo-hyeon (1871–1955), Kim Il-sung's grandfather, who participated in anti-Japanese activities.»
Hyung-chan Kim (2003). «Kim Jong Il's North Korea and Its Survivability». Korea and World Affairs (Korea: Pʻyŏnghwa Tʻongil Yŏnʼguso) 27: 251. ISSN0251-3072. OCLC3860590. «One also has to accept the existence of Kim Bo-hyeon (1871–1955), Kim Il-sung's grandfather, who participated in anti-Japanese activities.»