@article {56183,
	title = {Relative Motion of Formation Flying with Elliptical Reference Orbit},
	journal = {International Journal of Advanced Research in Artificial Intelligence (IJARAI)},
	volume = {2},
	year = {2013},
	pages = {79 - 86},
	author = {Hany R Dwidar and Ashraf  H Owis}
}
