Palaeoecological evidence of the main postglacial vegetation and climate changes in Southwestern Bulgaria from the Neolithic to modern times - Bozilova, Elissaveta (The Struma/Strymon River Valley in prehistory. Proceedings of the International Symposium Strymon Praehistoricus, Kjustendil-Blagoevgrad (Bulgaria), Serres-Amphipolis (Greece), 27.09.-01.10.2004., 2007)