%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
%% 
%%  Beispiel 16-01-15 auf Seite 302.
%% 
%%  Copyright (C) 2016 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[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{169.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pst-tree}
\def\psedge#1#2{%
  \nccurve[angleA=0,angleB=180]{->}{#1}{#2}}
\def\psedgeDash#1#2{%
   \nccurve[angleA=0,angleB=180,%
       linestyle=dashed]{->}{#1}{#2}}
%StopShownPreambleCommands
\begin{document}
\pstree[treemode=R,levelsep=3cm]{\Tcircle{0}}{%
  \Tcircle{1}
  \Tcircle{2}
  \Tcircle[edge=\psedgeDash]{3}
  \Tcircle[edge=\psedgeDash]{4}}
\end{document}