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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Levene, Mark; Loizou, George (1999), A Guided Tour of Relational Databases and Beyond, Springer, p. 72, ISBN 9781852330088. <a href="9781852330088" target="_blank">9781852330088</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Narang, Rajesh (2011), Database Management Systems, PHI Learning Pvt. Ltd., p. 70, ISBN 9788120343139. <a href="9788120343139" target="_blank">9788120343139</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>