@book{Covington:1994:2,
	title = {Natural Language Processing for Prolog Programmers},
	address = {Englewood Cliffs, NJ},
	author = {Michael A. Covington},
	publisher = {Prentice-Hall},
	year = {1994},
	biburl = {http://www.bibsonomy.org/bibtex/213795b7223508e1b7c2f20f1761c4979/diego_ma},
	keywords = {NLP prolog }
}