@article {9,
	title = {A methodology for conceptual representation of knowledge using Attribute Grammars},
	journal = {Augewandte Informatik},
	volume = {31},
	year = {1989},
	month = {00/1989},
	pages = {287-293},
	type = {Conceptual Knowledge Representation},
	author = {G. Vouros and C.D.Spyropoulos}
}
