$ locate jureco.bst
/opt/local/share/texmf-dist/bibtex/bst/jurabib/jureco.bst
/opt/local/var/macports/software/texlive_texmf-full/2007_3/opt/local/share/texmf-dist/bibtex/bst/jurabib/jureco.bst
/usr/local/texlive/2008/texmf-dist/bibtex/bst/jurabib/jureco.bst