\documentclass[12pt,a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage{natbib,bibentry}
\begin{document}
\bibliographystyle{plain}
\nobibliography{bibentry_plain}
\noindent
Input:

\begin{verbatim}
\documentclass{article}
\usepackage{natbib,bibentry}

\begin{document}

\bibliographystyle{plain}
\nobibliography{bibentry_plain}

\begin{itemize}
   \item \bibentry{zysk-conj}.
   \item \bibentry{ping-cata}.
\end{itemize}

\end{document}
\end{verbatim}



\noindent
Output, after running \LaTeX\ and Bib\TeX:

\begin{itemize}
   \item \bibentry{zysk-conj}.
   \item \bibentry{ping-cata}.
\end{itemize}

\end{document}
