Pavel Serdyukov Ling Feng Arthur H. van Bunningen Sander Evers Harold van Heerde Peter M. G. Apers Maarten M. Fokkinga Djoerd Hiemstra The Right Expert at the Right Time and Place. 38-49 2008 PAKM http://dx.doi.org/10.1007/978-3-540-89447-6_6 conf/pakm/2008 db/conf/pakm/pakm2008.html#SerdyukovFBEHAFH08