<?xml version="1.0"?>
<dblp>
<article key="journals/jsyml/HajekK89" mdate="2010-04-23">
<author>Petr H&#225;jek</author>
<author>Anton&#237;n Kucera</author>
<title>On Recursion Theory in I Sigma<sub>1</sub>.</title>
<pages>576-589</pages>
<year>1989</year>
<volume>54</volume>
<journal>J. Symb. Log.</journal>
<number>2</number>
<url>db/journals/jsyml/jsyml54.html#HajekK89</url>
<ee>http://projecteuclid.org/euclid.jsl/1183742928</ee>
</article>
</dblp>
