<a href="https://en.wikipedia.org/wiki/Ludwig_Boltzmann" class="extiw" title="en:Ludwig Boltzmann">Ludwig Boltzmann</a> (1844-1906), Austrian physicist
Unknown author<span style="display: none;">Unknown author</span>
1902
<a rel="nofollow" class="external text" href="https://web.archive.org/web/20061209230330/http://www.physik.uni-frankfurt.de/~jr/gif/phys/boltzmann2.jpg">Uni Frankfurt</a>