| The k-gracefulness on the Product of graphs pm and c4n |
| Received:July 26, 1987 |
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| Abstract: |
| Let k be a positive integer. The simple graph G=(V, E) is called k-graceful if there exists a injection. |
| Citation: |
| DOI:10.3770/j.issn:1000-341X.1989.04.032 |
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