^https://www.wien.gv.at/wiki/index.php/Boltzmanngasse Boltzmanngasse, Wien Geschichte Wiki (German), retrieved 20 November 2015.
^http://www.w-volk.de/museum/street32.htm Street-signs related to Ludwig Boltzmann, Leopold Kronecker, Gottfried Wilhelm Leibniz, Isaac Newton, and Brook Taylor in Berlin (Germany) (German/English), April 2013, retrieved 20 November 2015.