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  • × year_i:[2000 TO 2010}
  1. Adams, A.: Using the International Patent Classification in an online environment (2000) 8.63
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  2. Adams, S.: Comparing the IPC and the US classification systems for the patent searcher (2001) 8.63
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  3. Leydesdorff, L.: Patent classifications as indicators of intellectual organization (2008) 8.63
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