@article {17818,
	title = {Computational Logic: Logic Programming and Beyond, Essays in Honour of Robert A},
	journal = {Kowalski, Part I},
	year = {2002},
	month = {2002///},
	pages = {586 - 625},
	author = {Eiter,T. and Mascardi,V. and V.S. Subrahmanian}
}
