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"Integrality Ratio for Group Steiner Trees and Directed Steiner Trees."
Eran Halperin et al. (2007)
- Eran Halperin, Guy Kortsarz, Robert Krauthgamer, Aravind Srinivasan, Nan Wang:
Integrality Ratio for Group Steiner Trees and Directed Steiner Trees. SIAM J. Comput. 36(5): 1494-1511 (2007)
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