The chronology of the Aurignacian and of the transitional technocomplexes : dating, stratigraphies, cultural implications ; proceedings of symposium 6.1 of the XIVth Congress of the UISPP (University of Liège, Belgium, September 2-8, 2001) - Zilhão, João; D'Errico, Francesco (Instituto Português de Arqueologia, 2003)