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  • × year_i:[2020 TO 2030}
  1. Laakso, M.; Matthias, L.; Jahn, N.: Open is not forever : a study of vanished open access journals (2021) 10.09 
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  2. Jahn, N.; Matthias, L.; Laakso, M.: Toward transparency of hybrid open access through publisher-provided metadata : an article-level study of Elsevier (2022) 10.09 
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