Central sites on the periphery? The development of Slavonic ramparts on islands in freshwater lakes in Northern Germany (8th - 12th century AD) - Bleile, Ralf (Landscapes and human development. The contribution of european archaeology. Proceedings of the International Workshop "Socio-Environmental Dynamics over the Last 12.000 Years : The Creation of Landscapes (1st-4th April 2009)"., 2010)