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\documentclass[a4paper]{article}

\usepackage{newgen_domain}
\usepackage[backref,pagebackref]{hyperref}

\title{Used Before Set Analysis}
\author{Nga Nguyen}
\begin{document}
\maketitle

\section{Introduction}

These newgen data structures are used to tell whether a variable
(formal parameter or common variable) in a called procedure must be
checked for used-before-set error or not.

\domain{import entity from "ri.newgen"}
{}

\domain{ubs\_check = module:entity x variable:entity}
{}
\domain{ubs = list:ubs\_check*}
{}
\end{document}