| Article ID: | iaor19911661 |
| Country: | Netherlands |
| Volume: | 30 |
| Issue: | 1 |
| Start Page Number: | 63 |
| End Page Number: | 75 |
| Publication Date: | Jan 1991 |
| Journal: | Discrete Applied Mathematics |
| Authors: | Zhang Fu-ji, Chen Rong-si |
In this paper the authors establish a simple criterion which enables them to determine whether or not a hexagonal system