... system¹

http://www.newsinessence.com

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...prestige²

``Prestige" and ``centrality" stand for the same concept with the difference that the former is often defined for directed graphs whereas the latter is defined for undirected graphs.

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... ROUGE³

http://www.isi.edu/~cyl/ROUGE

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... MEAD⁴

http://www.summarization.com

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