@book {Stevens-1974-PNA,
	author=		"Peter S. Stevens",
	publisher=	"Little Brown and Co",
	title=		"Patterns in Nature",
	year=		"1974",
	theme=		"art and perception and natural",
	project=	"art and bat",
	added-by=	"Daniel Acevedo",
	date-added=	"Mon October 6 14:46:22 2008"
}
@book {Stevens-1974-PNA-url,
	author=		"Peter S. Stevens",
	note=		" \url{http://vis.cs.brown.edu/docs/pdf/bib/g/Stevens-1974-PNA.pdf.html}{(pdf)} \url{http://vis.cs.brown.edu/results/bibtex/Stevens-1974-PNA.bib}{(bibtex: Stevens-1974-PNA)}",
	publisher=	"Little Brown and Co",
	title=		"Patterns in Nature",
	year=		"1974",
	theme=		"art and perception and natural",
	project=	"art and bat",
	added-by=	"Daniel Acevedo",
	date-added=	"Mon October 6 14:46:22 2008"
}