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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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Lambert, N.: ORBIT'S PowerSearch : what's great, what's missing (1994)
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Poynder, R.: Patent information for the masses (1997)
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Jascó, P.: CD-ROM databases with full-page images (1998)
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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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