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Kay, L.; Newman, N.; Youtie, J.; Porter, A.L.; Rafols, I.: Patent overlay mapping : visualizing technological distance (2014)
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Thielen, J. van: Online classification and indexation of documents at the European Patent Office (1998)
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Stock, M.; Stock, W.G.: Intellectual property information : A comparative analysis of main information providers (2006)
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Kousha, K.; Thelwall, M.: Patent citation analysis with Google (2017)
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