The Gorizia Document(link is external). Regional Report of the DPPI Operational Team (Special Co-ordinator of the Stability Pact for South Eastern Europe, Disaster Preparedness and Prevention Initiative (DPPI), 2001.
Schade, Peter. Grundgesetz mit Kommentierung. Regensburg: Walhalla Fachverlag, 2001.
Bakken, B.E.. Handbook on Long Term Defence Planning.. Paris: NATO Research and Technology Agency, 2001.