@conference {7,
	title = {Improved Orbit Estimation using GPS Measurements for Conjunction Analysis},
	booktitle = {ION Global Navigation Satellite Systems Conference},
	year = {2008},
	month = {09/2008},
	publisher = {Institute of Navigation},
	organization = {Institute of Navigation},
	address = {Savannah, GA},
	author = {Alana Muldoon and Gabriel H Elkaim}
}
