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https://www.academia.edu/855411/Hendrickx_S_The_chronology_workshop_in_Friedman_R_F_and_Fiske_P_N_eds_Egypt_at_its_Origins_3_Proceedings_of_the_International_Conference_Origin_of_the_State_Predynastic_and_Early_Dynastic_Egypt_London_27th_July_1st_August_2008_OLA_205_Leuven_2011_911_915