@inproceedings {Zeleznik-2002-PTB,
	author=		"Robert Zeleznik and Joseph LaViola and Daniel Acevedo and Daniel Keefe",
	booktitle=	"Proceedings of Virtual Reality 2002",
	month=		"March",
	pages=		"127--134",
	title=		"Pop through buttons for virtual environment navigation and interaction",
	year=		"2002",
	theme=		"vr",
	project=	"cavepainting",
	added-by=	"Daniel Keefe",
	date-added=	"Thu June 27 12:45:17 2002"
}
@inproceedings {Zeleznik-2002-PTB-url,
	author=		"Robert Zeleznik and Joseph LaViola and Daniel Acevedo and Daniel Keefe",
	booktitle=	"Proceedings of Virtual Reality 2002",
	month=		"March",
	note=		" \url{http://vis.cs.brown.edu/docs/pdf/g/Zeleznik-2002-PTB.pdf.html}{(pdf)} \url{http://vis.cs.brown.edu/results/bibtex/Zeleznik-2002-PTB.bib}{(bibtex: Zeleznik-2002-PTB)}",
	pages=		"127--134",
	title=		"Pop through buttons for virtual environment navigation and interaction",
	year=		"2002",
	theme=		"vr",
	project=	"cavepainting",
	added-by=	"Daniel Keefe",
	date-added=	"Thu June 27 12:45:17 2002"
}