<bdi><a href="https://en.wikipedia.org/wiki/en:Ludwig_Gustav_Voltz" class="extiw" title="w:en:Ludwig Gustav Voltz"><span title="German animal and landscape painter (1825-1911)">Ludwig Gustav Voltz</span></a>
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<a rel="nofollow" class="external text" href="https://www.kollerauktionen.ch/de/316522-0001-----1166-voltz_-ludwig-_augsburg-1825-1166_53417.html?RecPos=2">Koller Auktionen, 20 September 2013, Lot 3236</a>