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Axenovich, Maria; Martin, Ryan R. Multicolor and directed edit distance. (English) Zbl 1269.05061 J. Comb. 2, No. 4, 525-556 (2011). MSC: 05C35 05C20 05C15 05C80 PDFBibTeX XMLCite \textit{M. Axenovich} and \textit{R. R. Martin}, J. Comb. 2, No. 4, 525--556 (2011; Zbl 1269.05061) Full Text: DOI arXiv