Return Type
This selection determines what type of references will be returned.
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If "Abstracts" is selected, all abstracts selected by the query will be returned.
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If "References" is selected, all abstracts of articles are returned which
are references in the articles returned by the first query.
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If "Citations" is selected, all abstracts of articles are returned which
cite articles returned by the first query.
The numerical fields for selection determine for which papers the
references/citations are to be found.