@inbook {1,
	title = {Semantic Integration and Interoperability among Portals},
	booktitle = {Encyclopaedia of Portal Technology and Applications},
	year = {2007},
	publisher = {Idea Group Inc},
	organization = {Idea Group Inc},
	author = {K. Kotis and G. A. Vouros},
	editor = {K. Kotis}
}
