Operator for extracting BibEntry objects by index.
a BibEntry object
numeric indices of entries to extract, or a character vector of keys corresponding to the entries to be extracted.
logical, should attributes besides class be dropped from result?
an object of class BibEntry.
This method is different than the usual operator
[[ for lists in that a vector of indices may be specified.
This method behaves differently than the
[ operator for BibEntry objects in that it does not expand
crossreferences when returning, so that a parent entry or xdata entry will be dropped if it is not also indexed
when indexing the child entry.
This method is not affected by the value of
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