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  • × author_ss:"Yu, L."
  • × language_ss:"e"
  1. Yu, L.: Geographic information systems in library reference services : development and challenge (1998) 0.01 
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    Date
    17. 1.1999 13:50:22
  2. Yu, L.; Fan, Z.; Li, A.: ¬A hierarchical typology of scholarly information units : based on a deduction-verification study (2020) 0.01 
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    Date
    14. 1.2020 11:15:22

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