\begin{description}
\item[ABC] first item
\item[BCD] second one
+\item[{x y z}] with space
+\item % hi there
+[{x y % bla
+z}] and with comments
\end{description}
labelings:
\begin{lyxlist}{00.00.0000}
\item [label~1] first item
\item [label~2] second item
+\item [{$\left[\textrm{ }\right]^{x}$}] Label with space, math and ] in it
\end{lyxlist}
and bibliography:
\begin{thebibliography}{9}