@book{110090,
	author = {Boothby, William M.},
	title = {An introduction to differentiable manifolds and Riemannian geometry /},
	publisher = {Academic Press,},
	year = {2003.},
	address = {London : },
	edition = {Rev. 2nd ed.},
	url = {http://www.loc.gov/catdir/description/els031/2001097950.html}
}