Thomas Severiens, Michael Hohlfeld, Kerstin Zimmermann, Eberhard R. Hilf, PhysDoc - A Distributed Network of Physics Institutions Documents Collecting, Indexing, and Searching High Quality Documents by using Harvest, in “D-Lib Magazine”, December 2000, 6 (12)http://www.dlib.org/dlib/december00/severiens/12severiens.html PhysNet http://physnet.uni-oldenburg.de/PhysNet/ PhysNet-Charter http://www.eps.org/PhysNet/charter.html PhysDis http://elfikom.physik.uni-oldenburg.de/dissonline/PhysDis/dis_europe.html Open Archives: Distributed services for physicists and graduate students (OAD) http://ins.uni-oldenburg.de/projects/OAD/ MareNet http://www.marenet.de/ MathNet http://www.mathnet.de/ Harvest http://www.tardis.ed.ac.uk/harvest/ OAI http://www.openarchives.org/ DDB http://www.ddb.de/index_e.htm