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    <pubDate>Tue, 15 Apr 2008 11:04:02 +0200</pubDate>
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      <title>There are integral heptagons, no three points on a line, no four on a circle</title>
      <link>http://opus4.kobv.de/opus4-ubbayreuth/frontdoor/index/index/docId/376</link>
      <description>We give two configurations of seven points in the plane, no three points in a line, no four points on a circle with pairwise integral distances. This answers a famous question of Paul Erdös.</description>
      <author>Tobias Kreisel; Sasch Kurz</author>
      <category>preprint</category>
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      <pubDate>Tue, 15 Apr 2008 11:04:02 +0200</pubDate>
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