Michael Bieber Il Im Ronald E. Rice Ricki Goldman-Segall Ravi Paul Edward A. Stohr Starr Roxanne Hiltz Jennifer Preece Murray Turoff Towards Knowledge-Sharing and Learning in Virtual Professional Communities. 213 2002 HICSS http://csdl.computer.org/comp/proceedings/hicss/2002/1435/08/14350213babs.htm db/conf/hicss/hicss2002-8.html#BieberIRGPSHPT02