This question led to a new feature in a package:
The family of multicite commands based on
\cites typeset two or more citations from a list of keys. For example,
However, I can't find anything like
\volcites or even
My question is: How can I cite two or more volumes of a multivolume work in a single multicite command? Also, is it possible to do it style-independently?
In short, I'm looking for this: