@book{10257,
	author = {Becker, Katrin, and Becker, Melanie.},
	title = {String theory and M-theory :},
	publisher = {Cambridge University Press,},
	year = {c2007.},
	address = {Cambridge ;},
	url = {http://www.loc.gov/catdir/enhancements/fy0710/2007296021-d.html}
}