Kinship, concentration of population and hte emergence of the state in the Nile valley, in: Friedman, Renée; Fiske, Peter N. (eds), Egypt at its origins 3: proceedings of the Third International Conference “Origin of the State. Predynastic and Early Dynastic Egypt”, London, 27th July – 1st August 2008. Orientalia Lovaniensia Analecta 205. Leuven
Campagno, Marcelo. 2011