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Kettunen, K.; Kunttu, T.; Järvelin, K.: To stem or lemmatize a highly inflectional language in a probabilistic IR environment? (2005)
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Kettunen, K.: Reductive and generative approaches to management of morphological variation of keywords in monolingual information retrieval : an overview (2009)
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Airio, E.; Kettunen, K.: Does dictionary based bilingual retrieval work in a non-normalized index? (2009)
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