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I. Kanj, Nakhleh, L., and Xia, G., Reconstructing Evolution of Natural Languages: Complexity and Parameterized Algorithms, in Proceedings of the 12th Annual International Computing and Combinatorics Conference (COCOON 2006), 2006, vol. 4112, pp. 299-308.
I. A. Kanj, Nakhleh, L., Than, C., and Xia, G., Seeing the trees and their branches in the network is hard, in Proceedings of the Tenth Italian Conference on Theoretical Computer Science (ICTCS), 2007, pp. 82-93.