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Question

I want to put a title field in a bibtex citation that includes angle brackets:

@article{
  title= { <foo> }
}

but when it compiles I get upside down '!' and '?' instead. How to escape the angle bracket?

Answer

I had a great deal of trouble with angle brackets in my doi fields until I switched to using the biblatex package. With the natbib=true option set, this was nearly a drop-in replacement for natbib. The angle brackets problem solved itself without further work on my part and my doi's became clickable. I don't know if it would work for your title brackets, but I'd suggest it as worth looking into.