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Topic Clustering of articles cited in biological review articles. (A) The cost of detection of Group C with different features; namely, semantic types only (S); combined semantic types and MeSH terms (S+M); semantic types with MeSH terms and title (S+M+T); all four features (S+M+T+A); the MeSH terms alone (M); and combined title and abstract (T+A). (B) The cost of detection of three groups (A, B and C) with the semantic types as the feature.
