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+\section{Introduction}
+
+This paper presents {\MathQL} version 4 which is the latest version of the
+language, fully developed by Ferruccio Guidi.  
+For a description of the previous versions of {\MathQL} see: \cite{Gui03}
+(version 3), \cite{GS03} (version 2), \cite{Lor02} (version 1).