Reference
Cajus G. Diedrich (2005): Cracking and nibbling marks as indicators for the Upper Pleistocene spotted hyaena as a scavenger of cave bear (Ursus spelaeus Rosenmüller 1794) carcasses in the Perick caves den of Northwest Germany – Abhandlungen der Naturhistorischen Gesellschaft Nürnberg – 45: 73 - 90.