@book {vanRossum-2003-PTR,
	author=		"Guido van Rossum",
	publisher=	"Python Software Foundation",
	title=		"Python Tutorial Release 2.3.3",
	year=		"2003",
	theme=		"",
	project=	"",
	added-by=	"Daniel Acevedo",
	date-added=	"Sat August 1 10:55:31 2009"
}
@book {vanRossum-2003-PTR-url,
	author=		"Guido van Rossum",
	note=		" \url{http://vis.cs.brown.edu/results/bibtex/vanRossum-2003-PTR.bib}{(bibtex: vanRossum-2003-PTR)}",
	publisher=	"Python Software Foundation",
	title=		"Python Tutorial Release 2.3.3",
	year=		"2003",
	theme=		"",
	project=	"",
	added-by=	"Daniel Acevedo",
	date-added=	"Sat August 1 10:55:31 2009"
}