<bdi><a href="https://www.wikidata.org/wiki/Q1040249" class="extiw" title="d:Q1040249"><span title="German painter (1810-1889)">Robert Kummer</span></a>
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<a rel="nofollow" class="external text" href="http://www.arcadja.com/auctions/de/private/kummer_carl_robert/kunstwerken/582861/0/">Kastern, Hannover, 03.09.2017, lot 40 via Arcadja auction results</a>