<?xml version="1.0"?>
<dblp>
<article key="journals/ai/KautzS91" mdate="2003-11-19">
<author>Henry A. Kautz</author>
<author>Bart Selman</author>
<title>Hard Problems for Simple Default Logics.</title>
<pages>243-279</pages>
<year>1991</year>
<volume>49</volume>
<journal>Artif. Intell.</journal>
<number>1-3</number>
<url>db/journals/ai/ai49.html#KautzS91</url>
</article>
</dblp>
