<?xml version="1.0"?>
<dblp>
<article key="journals/aml/GradelOR99" mdate="2008-07-15">
<author>Erich Gr&#228;del</author>
<author>Martin Otto</author>
<author>Eric Rosen</author>
<title>Undecidability results on two-variable logics.</title>
<pages>313-354</pages>
<year>1999</year>
<volume>38</volume>
<journal>Arch. Math. Log.</journal>
<number>4-5</number>
<ee>http://dx.doi.org/10.1007/s001530050130</ee>
<url>db/journals/aml/aml38.html#GradelOR99</url>
</article>
</dblp>
