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  1. Tveiteras, A.: Kontinuereling omklassifisering hvis internasjonal prakis skal tilstrebes? (1984) 0.00
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    Source
    Bog og Bibliotek. 51(1984) no.1, S.29-31
  2. Olsen, A.N.: Hyllesignaturer og ISBN for det virtuelle bibliotek (1996) 0.00
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    Abstract
    Network-based documents should be registered in the library's catalogue system in the same way as all other resources, but problems arise from the fact that they refer to intellectual content rather than physical entities. Bibsys uses MARC field 856 based on a system of address developed by Internet experts. The WWW service was developed using existing models of address such as URL. But URL does not provide a system of unambiguous and szable document names with locations; for this a combination of ISBN and a local shelf mark is required. An international structure for URN could be in place soon. The Norwegian National Library should begin to preparer for this with a continuation of ISBN and ISSN for net documents within a URN framework