it (except by
an oral presentation in a conference &#8211; Mattos, 1984)</span><span style="font-family: ms sans serif;">, but a brief description of the
work appeared in a portuguese
publication of INPE (<a href="#Carrara_1990">Carrara, 1990</a>).<br>
      </span><br>
<div style="text-align: center;"><span style="font-family: ms sans serif;"><big><big><span style="font-weight: bold;">MSIS-86</span></big></big></span><br>
      <span style="font-family: ms sans serif;"></span></div>
      <span styl