Claus-Peter Klas Hanne Albrechtsen Norbert Fuhr Preben Hansen Sarantos Kapidakis László Kovács Sascha Kriewel András Micsik Christos Papatheodorou Giannis Tsakonas Elin K. Jacob A Logging Scheme for Comparative Digital Library Evaluation. 267-278 2006 conf/ercimdl/2006 ECDL http://dx.doi.org/10.1007/11863878_23 db/conf/ercimdl/ecdl2006.html#KlasAFHKKKMPTJ06