Pre-Bell Beaker ware from Estremadura, Portugal, and its likely influence on the appearance of Maritime Bell Beaker ware. - Amaro, Gonçalo de Carvalho (Current researches on bell beakers : proceedings of 15th International Bell Beaker : From Atlantic to Ural, 5th-9th May 2011, Poio (Pontevedra, Galicia, Spain)., 2013)