@book{56533,
	author = {Kiritsis, Elias.},
	title = {String theory in a nutshell /},
	publisher = {Levant Books,},
	year = {©2007.},
	address = {Kolkata :},
	url = {http://www.loc.gov/catdir/enhancements/fy0704/2006050586-d.html}
}