Kim K. H. and Roush Fred William: Enumeration of certain words. In: Acta cybernetica, (4) 4. pp. 383-387. (1980)
Kim K. H. and Roush Fred William: Schützenberger's monoids. In: Acta cybernetica, (4) 3. pp. 269-272. (1979)
Kim Ki Hang and Roush Fred William: Counting additive spaces of sets. In: Acta scientiarum mathematicarum, (40) 1-2. pp. 81-87. (1978)
Kim Ki Hang and Roush Fred William: Quasi-varieties of binary relations. In: Acta scientiarum mathematicarum, (40) 1-2. pp. 89-91. (1978)