Research and Advanced Technology for Digital Libraries 5th European Conference, ECDL 2001, Darmstadt, Germany, September 4-9, 2001. Proceedings - Constantopoulos, Panos; Constantopoulos, Panos; Solvberg, Ingeborg T.; Solvberg, Ingeborg T. (Springer Berlin Heidelberg : Imprint: Springer, 2001)