Sven Döring Werner Kießling Timotheus Preisinger Stefan Fischer 0003 Evaluation and optimization of the catalog search process of e-procurement platforms. 44-56 2006 5 Electronic Commerce Research and Applications 1 http://dx.doi.org/10.1016/j.elerap.2005.08.004 db/journals/ecra/ecra5.html#DoringKPF06