Ludger Bischofs Ulrike Steffens Organisation-Oriented Super-Peer Networks for Digital Libraries. 45-62 2004 conf/delos/2004lncs DELOS Workshop: Digital Library Architectures - LNCS Volume http://dx.doi.org/10.1007/11549819_4 db/conf/delos/delos2004lncs.html#BischofsS04