Dwca::GbifProfile::Reference#identifier=

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identifier (http://purl.org/dc/terms/identifier)

@return [String]
DOI, ISBN, URI, etc refering to the reference. This can be repeated in
multiple rows to include multiple identifiers, e.g. a DOI and a URL
pointing to a pdf of the article.

Example: doi:10.1038/ng0609-637;
http://www.nature.com/ng/journal/v41/n6/pdf/ng0609-637.pdf
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