| |
| 1997 | ||
|---|---|---|
| 2 | EE | Zhikang Lu: The exact value of the harmonious chromatic number of a complete binary tree. Discrete Mathematics 172(1-3): 93-101 (1997) |
| 1993 | ||
| 1 | EE | Zhikang Lu: The harmonious chromatic number of a complete binary and trinary tree. Discrete Mathematics 118(1-3): 165-172 (1993) |