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		<id>https://en.formulasearchengine.com/index.php?title=Laue_equations&amp;diff=260207</id>
		<title>Laue equations</title>
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		<updated>2012-01-13T13:34:26Z</updated>

		<summary type="html">&lt;p&gt;90.217.174.249: Clarify the derivation (see Kittel 7th Ed., p36)&lt;/p&gt;
&lt;hr /&gt;
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		<author><name>90.217.174.249</name></author>
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