<?xml version="1.0"?>
<dblp>
<article key="journals/apal/FriedmanV97" mdate="2003-11-28">
<author>Sy D. Friedman</author>
<author>Boban Velickovic</author>
<title>Delta<sub>1</sub>-Definability.</title>
<pages>93-99</pages>
<year>1997</year>
<volume>89</volume>
<journal>Ann. Pure Appl. Logic</journal>
<number>1</number>
<url>db/journals/apal/apal89.html#FriedmanV97</url>
</article>
</dblp>
