@book{175707,
	author = {Helvoort, Huub van.},
	title = {SDH/SONET explained in functional models :},
	publisher = {Wiley,},
	year = {c2005.},
	address = {Chichester ;},
	url = {http://www.loc.gov/catdir/enhancements/fy0653/2006530740-d.html}
}