@book{16403,
	author = {Nihad Saad Abdelmotelp  and Monir Ahmed Hamdy , },
	title = {Stability of the lagrangian points against radiation pressure / },
	publisher = {Nihad Saad Abdelmotelp , },
	year = {2008},
	address = {Cairo : },
	url = {http://172.23.153.220/th.pdf}
}