Charles Nebolsky Nicholas K. Yee Valery A. Petrushin Anatole Gershman Using Virtual Worlds for Corporate Training. 412-413 2003 conf/icalt/2003 ICALT http://csdl.computer.org/comp/proceedings/icalt/2003/1967/00/19670412abs.htm db/conf/icalt/icalt2003.html#NebolskyYPG03