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Table 1 Algorithm of citations-over-age index determination in PubMed Basic mode

From: PubFocus: semantic MEDLINE/PubMed citations analytics through integration of controlled biomedical dictionaries and ranking algorithm

   Age
   < = 1 year > 1 and < = 3 years >3 and < = 5 years > 5 years
Forward Citations No forward citations 1 1 0.75 0.5
  Present forward citations 1.5 1.25 1 1