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"Every strong digraph has a spanning strong subgraph with at most ..."
Stéphane Bessy, Stéphan Thomassé (2003)
- Stéphane Bessy, Stéphan Thomassé:
Every strong digraph has a spanning strong subgraph with at most n+2 alpha-2 arcs. J. Comb. Theory B 87(2): 289-299 (2003)
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