@conference {34, title = {Improved Orbital Debris Trajectory Estimation Based on Sequential TLE Processing}, booktitle = {IAC2009}, year = {2009}, month = {10/2009}, publisher = {60th International Astronautical Congress}, organization = {60th International Astronautical Congress}, address = {Daejeon, Korea}, author = {Alana Muldoon and Gabriel H Elkaim and B Wheeden} } @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} }