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"Digraphs that have at most one walk of a given length with the same endpoints."
Zejun Huang, Xingzhi Zhan (2011)
- Zejun Huang, Xingzhi Zhan:
Digraphs that have at most one walk of a given length with the same endpoints. Discret. Math. 311(1): 70-79 (2011)
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