This property associates a bibliographic agency (represented by one or more of its cataloguers) and the assigning of which expression is representative for a given Work. In cataloguing practice, such a relationship is usually just implicit. However, it can become explicit, for example when a bibliographic agency creates an authority record for a given work and fills the "Source" field with information about the publication that contains the expression that was used by the bibliographic agency to establish the uniform title for the work realised in that expression.
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