TIPA package causing error in xelatex: \sups already defined

Question

I am trying to include some of my publications in my CV, which it typeset in LaTeX. I have a .bib file and I call the references using \bibverse{}. The problem is that I am unable to compile the document, and I believe this is happening because some of the articles have IPA symbols in the title. I get the following error:

Argument of \BR@@lbibitem has an extra }. [   \bibverse{article2012}]

The bib items do not have extra }'s. My initial guess was that the IPA symbols in the title were causing the problem, so I included the TIPA package, and got the following error:

LaTeX Error: Command \sups already defined. [  \lower.8ex\hbox{\super{#2}}}{#1}}}]

I am unclear on what \sups are and google searching has not been of any help. I am aware that TIPA should not be necessary when using XeLaTex. One possibility would be to not use TIPA in my .bib file, but the problem is that I use this file in many documents that are not compiled in xelatex so I prefer to keep it constant.

This is what my preamble looks like:

\documentclass[11pt]{article}
\usepackage{url,fancyhdr}
\usepackage{fontspec}
\usepackage{xunicode}
\usepackage[usenames,dvipsnames]{color}
\usepackage{tipa}
\usepackage{geometry}
\usepackage{multicol}
\usepackage[spanish, english]{babel}
\usepackage{natbib}
\usepackage{bibentry}
\newcommand{\bibverse}[1]{\begin{verse} \bibentry{#1}. \end{verse}}

\begin{document}

\textteshlig
\bibverse{publication1}

\nobibliography*
\bibliographystyle{apalike}
\nobibliography{publicationsCV}
\end{document}

Edit: The reason I tried to compile the document using TIPA is because the .bib file includes ipa characters (i.e. \textteshlig). The reason for using the verse environment is to be able to insert full references (my publications) where need be. For example, my cv has a section for conference presentations. If I were to simply generate a bibliography I would have no control over what goes where. Here is an example of what the bib verse looks like in the .tex file.

\bibverse{publication1}

And here is an example of what it looks like in the .bib file.

@conference{publication1,
Author = {My Name},
Month = {April},
Organization = {In Selected Proceedings of the a Conference.},
Place = {University of Somewhere, City, State},
Publisher = {Some publisher},
Title = {Title with IPA symbols: /\textteshlig/},
Year = {2013}}

This works fine in other documents compiled with pdflatex.