<?xml version="1.0"?>
<dblp>
<article key="journals/tods/LockemannMWW79" mdate="2006-04-03">
<author>Peter C. Lockemann</author>
<author>Heinrich C. Mayr</author>
<author>Wolfgang H. Weil</author>
<author>Wolfgang H. Wohlleber</author>
<title>Data Abstractions for Database Systems.</title>
<pages>60-75</pages>
<cdrom>TODS4/P060.PDF</cdrom>
<year>1979</year>
<volume>4</volume>
<journal>ACM Trans. Database Syst.</journal>
<number>1</number>
<url>db/journals/tods/tods4.html#LockemannMWW79</url>
<ee>http://doi.acm.org/10.1145/320064.320067</ee>
<ee>db/journals/tods/LockemannMWW79.html</ee>
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