Boat-shaped battle axe from <a href="https://en.wikipedia.org/wiki/N%C3%A4rke" class="extiw" title="en:Närke">Närke</a>, Sweden
Nordisk familjebok
1917
<a href="//commons.wikimedia.org/wiki/Nordisk_familjebok" title="Nordisk familjebok">Nordisk familjebok</a> (1917), vol.26, <i>Till art. Stenålder. I.</i> <a rel="nofollow" class="external autonumber" href="http://runeberg.org/nfcf/0685.html">[1]</a>