Abstract
It is shown that there exist exactly twenty products of graphs defined on the Cartesian product of the vertex sets of the factors where the adjacencies of the vertices only depend on the adjacencies in the factors.
| Original language | English |
|---|---|
| Pages (from-to) | 277-281 |
| Number of pages | 5 |
| Journal | Monatshefte für Mathematik |
| Volume | 80.1975 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Dec 1975 |