# Latex Back Referencing Overfull \hbox Problem with hyperref [duplicate]

I encountered an issue with hyperref, as I wrote a long thesis. I have to \cite{} some references very often, then the back referencing becomes longer than one line (see the picture below). When this happens, I encounter the "Overfull \hbox" warning, which I really do not like (I want the output message without any warning and error). People seldom cite one reference in many pages, however, this is what I have to do. Since the back referencing number (links) becomes long, and do not break into multiple lines, this "Overfull \hbox" warning seems will not disappear, as I am continuing expanding my document pages (and citations to the same reference). Are there any way to suppress this warning, or a command to make long back referencing into multiple lines? Thank you very much!

This is one example with long backref, which encoutered the "Overfull \hbox" warning. The below is how I use the [hyperref] package.