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Yun Chi Yi Xia Yirong Yang Richard R. Muntz Correction to "Mining Closed and Maximal Frequent Subtrees from Databases of Labeled Rooted Trees". 1737 2005 17 IEEE Trans. Knowl. Data Eng. 12 http://doi.ieeecomputersociety.org/10.1109/TKDE.2005.193 db/journals/tkde/tkde17.html#ChiXYM05a