<bdi><a href="https://en.wikipedia.org/wiki/en:Carl_Arp" class="extiw" title="w:en:Carl Arp"><span title="German landscape painter (1867-1913)">Carl Arp</span></a>
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<a rel="nofollow" class="external text" href="https://www.arcadja.com/auctions/de/author-lots/v7qtkemq/">Kastern, Hannower, 22.09.2012, lot 13 via Arcadja auctions results</a>