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  • × year_i:[1990 TO 2000}
  1. Leydesdorff, L.: ¬The generation of aggregated journal-journal citation maps on the basis of the CD-ROM version of the Science Citation Index (1994) 7.22 
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  2. Leydesdorff, L.: Why words and co-word cannot map the development of the science (1997) 7.22 
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  3. Leydesdorff, L.: Theories of citation? (1999) 7.22 
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