<bdi><a href="https://en.wikipedia.org/wiki/en:Isaac_Newton" class="extiw" title="w:en:Isaac Newton"><span title="English physicist and mathematician (1642–1727)">Isaac Newton</span></a>
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<a rel="nofollow" class="external text" href="http://www.e-rara.ch/doi/10.3931/e-rara-1743">Bibliothèque électronique suisse</a>