<?xml version="1.0"?>
<dblp>
<article key="journals/ipm/HeapsT70" mdate="2009-04-14">
<author>H. S. Heaps</author>
<author>Larry H. Thiel</author>
<title>Optimum procedures for economic information retrieval.</title>
<pages>137-153</pages>
<year>1970</year>
<volume>6</volume>
<journal>Information Storage and Retrieval</journal>
<number>2</number>
<ee>http://dx.doi.org/10.1016/0020-0271(70)90057-4</ee>
<url>db/journals/ipm/ipm6.html#HeapsT70</url>
</article>
</dblp>
