<?xml version="1.0"?>
<dblp>
<article key="journals/jcss/ChandraH82" mdate="2003-11-20">
<author>Ashok K. Chandra</author>
<author>David Harel</author>
<title>Structure and Complexity of Relational Queries.</title>
<pages>99-128</pages>
<year>1982</year>
<volume>25</volume>
<journal>J. Comput. Syst. Sci.</journal>
<number>1</number>
<url>db/journals/jcss/jcss25.html#ChandraH82</url>
</article>
</dblp>
