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Optical variable device
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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>"More about Optically Variable Devices (OVDs)" Product Authentication & Security Directory <a href="http://www.pasdirectory.com/more_ovd.htm" target="_blank">http://www.pasdirectory.com/more_ovd.htm</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Council of the European Union, General Secretariat (10 May 2020). "The Council of the European Union PRADO Glossary". PRADO Glossary. Retrieved 10 May 2020. <a href="https://www.consilium.europa.eu/prado/en/prado-glossary.html" target="_blank">https://www.consilium.europa.eu/prado/en/prado-glossary.html</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Council of the European Union, General Secretariat (10 May 2020). "The Council of the European Union PRADO Glossary". PRADO Glossary. Retrieved 10 May 2020. <a href="https://www.consilium.europa.eu/prado/en/prado-glossary.html" target="_blank">https://www.consilium.europa.eu/prado/en/prado-glossary.html</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>