Question: ```
\documentclass{doublecol-new}
\def\newblock{\hskip .11em plus .33em minus .07em}
\begin{document}
\setcounter{page}{1}
\title{IJKL}

\maketitle

\begin{abstract}
\end{abstract}

\section{Introduction}
\cite{jojo}

\begin{thebibliography}{10}

\bibitem{jojo} ABCD
\end{thebibliography}

\end{document} 

```

Above is a minimum working example which compiles, but leaves a ? mark when I try to cite the bibitem. Could anyone please help me fix this.

PS: Link to the cls file: <http://www.inderscience.com/www/download/latex-double-column.zip>. Unzipping the linked file would provide the cls file.

Answer: 
Using minus or dash characters did not work for me. But changing the font did. I added `\lstset{basicstyle=\ttfamily}` to the preamble and it worked fine.
As gernot pointed out, I was using the dash-character "-"

I needed to use the minus character "-"

I did not even realize they were different