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<footer id='references'>
<h2>References</h2>
<ul>
- <li></li>
+ <li>
+ <a href='http://www.ctaps.yu.edu.jo/physics/Courses/Phys207/Supplements/Phys207_Suppl1_SHO_Springs.pdf'>
+ Springs in Series and Parallel
+ </a>
+ </li>
</ul>
</footer>
</article>