@conference {Bille2004a, title = {Using Ontologies to Build Virtual Worlds for the Web}, booktitle = {Proceedings of the IADIS International Conference WWW/Internet 2004 (ICWI2004)}, volume = {1}, year = {2004}, pages = {683-690}, publisher = {IADIS PRESS}, organization = {IADIS PRESS}, address = {Madrid, Spain}, isbn = {972-99353-0-0}, author = {W. Bille and De Troyer, O. and F. Kleinermann and B. Pellens and R. Romero}, editor = {P. Isaias and N. Karmakar} }