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author_ss:"Sparck Jones, K."
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theme_ss:"Automatisches Indexieren"
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type_ss:"a"
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year_i:[1970 TO 1980}
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Sparck Jones, K.; Jackson, D.M.: ¬The use of automatically obtained keyword classification for information retrieval (1970)
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Sparck Jones, K.: Index term weighting (1973)
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