<?xml version="1.0"?>
<dblp>
<article key="journals/tods/WaldS90" mdate="2006-04-03">
<author>Joseph A. Wald</author>
<author>Paul G. Sorenson</author>
<title>Explaining Ambiguity in a Formal Query Language.</title>
<pages>125-161</pages>
<cdrom>TODS15/P125.PDF</cdrom>
<year>1990</year>
<volume>15</volume>
<journal>ACM Trans. Database Syst.</journal>
<number>2</number>
<url>db/journals/tods/tods15.html#WaldS90</url>
<ee>http://doi.acm.org/10.1145/78922.78923</ee>
<ee>db/journals/tods/WaldS90.html</ee>
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