<?xml version="1.0"?>
<dblp>
<article key="journals/jsyml/Bull65" mdate="2003-11-20">
<author>R. A. Bull</author>
<title>An Algebraic Study of Diodorean Modal Systems.</title>
<pages>58-64</pages>
<year>1965</year>
<volume>30</volume>
<journal>J. Symb. Log.</journal>
<number>1</number>
<url>db/journals/jsyml/jsyml30.html#Bull65</url>
</article>
</dblp>
