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  1. Rafols, I.; Porter, A.L.; Leydesdorff, L.: Science overlay maps : a new tool for research policy and library management (2010) 10.32 
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  2. Boer, V. de; Porter, A.L.; Someren, M. v.: Extracting historical time periods from the Web (2010) 10.32 
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  3. Kay, L.; Newman, N.; Youtie, J.; Porter, A.L.; Rafols, I.: Patent overlay mapping : visualizing technological distance (2014) 10.32 
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