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Cyril Allauzen, Michael Riley, Johan Schalkwyk, Wojciech Skut and Mehryar Mohri, "OpenFst: A General and Efficient Weighted Finite-State Transducer Library", Proceedings of the Ninth International Conference on Implementation and Application of Automata, (CIAA 2007), volume 4783 of Lecture Notes in Computer Science, pages 11-23. Springer, 2007. http://www.openfst.org.Here is a BibTex entry for this reference.