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"The kth upper bases of primitive non-powerful signed digraphs."
Yanling Shao, Jian Shen, Yubin Gao (2009)
- Yanling Shao, Jian Shen, Yubin Gao:
The kth upper bases of primitive non-powerful signed digraphs. Discret. Math. 309(9): 2682-2686 (2009)
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