PhysDoc: A Distributed Network of Physics Institutions Collecting, Indexing, and Searching High Quality Documents by using Harvest. - Thomas Severiens; Michael Hohlfeld; Kerstin Zimmermann; Eberhard R. Hilf (D Lib Mag., 2000)

MareNet - a new electronic information service for marine science. - Michael Hohlfeld (IuK, 2001)