Unfortunately, for those shackled to BibTeX and who cannot (yet) move to BibLaTeX, unicode is a major PITA. Also, Zotero supports some simple HTML markup in your items that Bib(La)TeX won't understand ...

If you make workwear, you’ve got to be able to build a long-lasting pair of bib overalls ... that makes work overalls with an attached nail apron, and we were pleasantly surprised by how ...