@incollection{Straccia14,
	Author = {Umberto Straccia},
	Booktitle = {Flexible Approaches in Data, Information and Knowledge Management},
	Chapter = {5},
	pages = {95--114},
	Editor = {Pivert, Olivier; Zadro{\.z}ny, S{\l}awomir},
	Publisher = {Springer Verlag},
	Series = {Studies in Computational Intelligence,},
	Title = {On the Top-k Retrieval Problem for Ontology-Based Access to Databases},
	Volume = {497},
	Year = {2014}}