Bulgarian Academy of Sciences, Independent, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Institute of Archaeology and Ethnology Polish Academy of Sciences, Adam Mickiewicz University, affiliation not provided to SSRN, Institute of Archaeology and Ethnology Polish Academy of Sciences, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Romanian Academy, Iasi Branch, affiliation not provided to SSRN, University of Helsinki and Institute of Archaeology and Ethnology Polish Academy of Sciences