@book{10960,
	author = {Veltman, Martinus.},
	title = {Diagrammatica :},
	publisher = {Cambridge University Press,},
	year = {1994.},
	address = {Cambridge :},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/description/cam027/95167612.html}
}