@article  {Spackman-1991-TSN,
	author=		"J. Spackman and P. Willis",
	journal=	"Computer and Graphics ",
	number=		"2 ",
	pages=		"185--194",
	title=		"The SMART navigation of a ray through an oct-tree ",
	volume=		"15  ",
	year=		"1991 ",
	theme=		"tech and medicine and art",
	project=	"wrist",
	added-by=	"Cagatay Demiralp",
	date-added=	"Wed Nov  6 15:24:14 EST 2002"
}
@article  {Spackman-1991-TSN-url,
	author=		"J. Spackman and P. Willis",
	journal=	"Computer and Graphics ",
	note=		" \url{http://vis.cs.brown.edu/results/bibtex/Spackman-1991-TSN.bib}{(bibtex: Spackman-1991-TSN)}",
	number=		"2 ",
	pages=		"185--194",
	title=		"The SMART navigation of a ray through an oct-tree ",
	volume=		"15  ",
	year=		"1991 ",
	theme=		"tech and medicine and art",
	project=	"wrist",
	added-by=	"Cagatay Demiralp",
	date-added=	"Wed Nov  6 15:24:14 EST 2002"
}