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References
Jurafsky, D., & Martin, J. H. (2009). Speech and language processing: An introduction to natural language processing, speech recognition, and computational linguistics (2nd ed.). New Jersey: Prentice-Hall.
Lutz, M. (2009). Learning python (4th ed.). Beijing: O’Reilly Media.
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Wagner, W. Steven Bird, Ewan Klein and Edward Loper: Natural Language Processing with Python, Analyzing Text with the Natural Language Toolkit. Lang Resources & Evaluation 44, 421–424 (2010). https://doi.org/10.1007/s10579-010-9124-x
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DOI: https://doi.org/10.1007/s10579-010-9124-x