\documentclass[11pt,a4paper]{article}
\usepackage{pstricks,pst-node,pst-tree,multido}
\usepackage{amsmath,amstext,amsthm,amsfonts,latexsym,bm}
\usepackage[dvips]{graphicx}
\usepackage[brazil]{babel}
\usepackage[latin1]{inputenc}
\usepackage{epsfig}
\begin{document}
\title{ }
\author{ }
\date{ }
\maketitle
\thispagestyle{empty}
\begin{abstract}
\end{abstract}
\end{document}