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		<id>https://en.formulasearchengine.com/w/index.php?title=Duffing_equation&amp;diff=244065</id>
		<title>Duffing equation</title>
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		<updated>2014-03-20T12:05:45Z</updated>

		<summary type="html">&lt;p&gt;130.149.89.24: /* Boundedness of the solution for the undamped and unforced oscillator */&lt;/p&gt;
&lt;hr /&gt;
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		<author><name>130.149.89.24</name></author>
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