@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}
}
