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Then you have an ePub that is made for use with calibre, but does not have its metadata in the spec-recommended format:
Publications with multiple co-authors should provide multiple creator elements, each containing one author. The order of creator elements is presumed to define the order in which the creators' names should be presented by the Reading System.
This specification recommends that the content of the creator elements hold the text for a single name as it would be presented to the Reader.
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