Duplicate title to 


    <span class="person"><a href="https://pure.iiasa.ac.at/view/iiasa/2117.html">Lewandowski, A.</a></span>
  

<span xmlns="http://eprints.org/ep3/control" class="date">(1981).</span>


    <span xmlns="http://eprints.org/ep3/control" class="title"><a href="https://pure.iiasa.ac.at/cgi/users/home?screen=EPrint::View&amp;eprintid=1729"><xhtml:em xmlns:xhtml="http://www.w3.org/1999/xhtml">Issues in Model Validation.</xhtml:em></a></span>
  


    IIASA Working Paper.
  <span xmlns="http://eprints.org/ep3/control" class="publication">IIASA, Laxenburg, Austria: WP-81-032</span>