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"Extremal digraphs whose walks with the same initial and terminal vertices ..."
Zejun Huang, Xingzhi Zhan (2012)
- Zejun Huang, Xingzhi Zhan:

Extremal digraphs whose walks with the same initial and terminal vertices have distinct lengths. Discret. Math. 312(15): 2203-2213 (2012)

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