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+%% 
+%%  A DANTE-Edition example
+%% 
+%%  Example 28-02-34 on page 547.
+%% 
+%%  Copyright (C) 2011 Herbert Voss
+%% 
+%%  It may be distributed and/or modified under the conditions
+%%  of the LaTeX Project Public License, either version 1.3
+%%  of this license or (at your option) any later version.
+%% 
+%%  See http://www.latex-project.org/lppl.txt for details.
+%% 
+%% 
+%% ==== 
+% Show page(s) 1
+%% 
+\documentclass[]{article}
+\pagestyle{empty}
+\setlength\textwidth{201.70511pt}
+\setlength\parindent{0pt}
+
+\usepackage{pstricks-add,pst-func}
+
+\begin{document}
+\begin{pspicture*}(-3,-2.2)(3.5,2.5)
+\psaxes{->}(0,0)(-3,-2)(3.2,2)
+\psplotImp[linewidth=2pt](-5,-2.2)(5,2.4){
+  /xqu x dup mul def /yqu y dup mul def
+  xqu yqu add dup mul 2 dup
+  add 2 mul xqu yqu sub mul sub }
+\rput*(2,1.5){%
+  $\left(x^2+y^2\right)^2-8(x^2-y^2)=0$}
+\psplotImp[linewidth=1pt,linecolor=red,
+  algebraic](-5,-2.2)(5,2.4){%
+   (x^2+y^2)^2-4*(x^2-y^2) }% Lemniskate a=2
+\end{pspicture*}
+\end{document}