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Lambert, N.: But what's in it for IBM? : 'free' patents on the Net (1997)
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Poynder, R.: Patent information for the masses (1997)
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Vacek, G.: Japanese patent information (1994)
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Blake, P.: ¬The arrival of free patent information : Internet provision of patent information for free is affecting vendors (1998)
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Guan, J.C.; Gao, X.: Exploring the h-index at patent level (2009)
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