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  1. Pŏphak immun.Pyŏng-hwa Yu - 1990 - Sŏul Tʻŭkpyŏlsi: Chinsŏngsa.
     
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  2. Pŏphak kaeron.Pyŏng-hwa Yu - 1982 - Sŏul Tʻŭkpyŏlsi: Pŏmmunsa.
     
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  3. Pŏpchʻŏrhak.Pyŏng-hwa Yu - 1990 - Sŏul Tʻŭkpyŏlsi: Chinsŏngsa.
     
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