| |
| 1994 | ||
|---|---|---|
| 2 | Fred S. Roberts, Yonghua Xu: On the Optimal Strongly Connected Orientations of City Street Graphs IV: Four East-West Avenues or North-South Streets. Discrete Applied Mathematics 49(1-3): 331-356 (1994) | |
| 1988 | ||
| 1 | Fred S. Roberts, Yonghua Xu: On the Optimal Strongly Connected Orientations of City Street Graphs I: Large Grids. SIAM J. Discrete Math. 1(2): 199-222 (1988) | |
| 1 | Fred S. Roberts | [1] [2] |