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author_ss:"Leydesdorff, L."
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theme_ss:"Informetrie"
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type_ss:"a"
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language_ss:"e"
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year_i:[1990 TO 2000}
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Leydesdorff, L.: ¬The generation of aggregated journal-journal citation maps on the basis of the CD-ROM version of the Science Citation Index (1994)
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Leydesdorff, L.: Why words and co-word cannot map the development of the science (1997)
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Leydesdorff, L.: Theories of citation? (1999)
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