See:
- Stavros Oikonomidis, Aristeidis Papayiannis,Akis Tsonos, The Emergence and the Architectural Development of the Tumulus Burial Custom in NW Greece (Epirus and the Ionian Islands) and Albania and its Connections to Settlement Organisation, in: Tumulus as Sema: Space, Politics, Culture and Religion in the First Millennium BC, Walter de Gruyter GmbH & Co KG 2016