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"The internal Steiner tree problem: Hardness and approximations."
Chao-Wen Huang et al. (2013)
- Chao-Wen Huang, Chia-Wei Lee

, Huang-Ming Gao, Sun-Yuan Hsieh:
The internal Steiner tree problem: Hardness and approximations. J. Complex. 29(1): 27-43 (2013)

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