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  1. Vijvers, W.G.: ¬The International Patent Classification as a search tool (1990) 8.65 
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  2. Wittmann, A.: Classifying and indexing of patent documents : a retired patent documentalist looks back (1994) 8.65 
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  3. Nishikawa, M.: Usefulness of hybrid systems in computerised searches (1990) 8.65 
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  4. Rozov, B.: About patent classification (1993) 8.65 
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  5. Adams, A.: Using the International Patent Classification in an online environment (2000) 8.65 
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  6. Faucompre, P.; Quoniam, L.; Dou, H.: ¬The function-application relation through a link between classification and indexing (1997) 8.65 
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  7. Faucompre, P.; Quoniam, L.; Dou, H.: ¬An effective link between science and technology (1997) 8.65 
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  8. Vries, S. de: Points of interest concerning the new IPC (1989) 8.65 
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  9. Rampelmann, J.: Classification tools at the EPO (1996) 8.65 
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  10. Kunin, S.: IPC and the new millennium : challenge and opportunity (1999) 8.65 
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  11. Adams, S.: Comparing the IPC and the US classification systems for the patent searcher (2001) 8.65 
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  12. Leydesdorff, L.: Patent classifications as indicators of intellectual organization (2008) 8.65 
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  13. Kay, L.; Newman, N.; Youtie, J.; Porter, A.L.; Rafols, I.: Patent overlay mapping : visualizing technological distance (2014) 8.65 
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