<?xml version="1.0"?>
<dblp>
<article key="journals/jsyml/MontagueH56" mdate="2003-11-20">
<author>Richard Montague</author>
<author>Leon Henkin</author>
<title>On the Definition of 'Formal Deduction'.</title>
<pages>129-136</pages>
<year>1956</year>
<volume>21</volume>
<journal>J. Symb. Log.</journal>
<number>2</number>
<url>db/journals/jsyml/jsyml21.html#MontagueH56</url>
</article>
</dblp>
