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  1. Hayes, R.M.: Measurement of information (1993) 10.31
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    Hayes, R.M.
  2. Hayes, R.M.: Cost of electronic reference resources and LC : the library costing model (1996) 10.31
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  3. Hayes, R.M.; Karlics, K.; Schloegl, C.: University libraries as a model for the determination of the need for information specialists in knowledge industries? : an exploratory analysis of the information sector in Austria (2013) 10.31
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