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author_ss:"Leeuwen, T.N. van"
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theme_ss:"Informetrie"
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year_i:[1990 TO 2000}
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theme_ss:"Citation indexing"
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Moed, H.F.; Leeuwen, T.N. van; Reedijk, J.: ¬A new classification system to describe the ageing of scientific journals and their impact factors (1998)
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