New Peripheries of Central Europe? Learning Options and Cooperation Blockades in a German-Polish Border-Milieu - The Case of the Twin City Guben/Gubin - Matthiesen, Ulf (. Problems and chances of the East enlargement of the EU. - Hamburg : Krämer, 2003. - 207 S.. - graph. Darst., Kt.. - ISBN 3-89622-052-7, 2003)