National Space Science Data Center/World Data Center for Satellite Information (July 1, 2007). "SPACEWARN Bulletin No. 644". NASA. Archived from the original on March 21, 2021. Retrieved August 9, 2010.
Todd Halvorson and John Kelly (June 4, 2007). "Orbiters Feel Pains of Aging". SPACE.com. Archived from the original on May 19, 2010. Retrieved August 7, 2010.
National Space Science Data Center/World Data Center for Satellite Information (July 1, 2007). "SPACEWARN Bulletin No. 644". NASA. Archived from the original on March 21, 2021. Retrieved August 9, 2010.
Todd Halvorson and John Kelly (June 4, 2007). "Orbiters Feel Pains of Aging". SPACE.com. Archived from the original on May 19, 2010. Retrieved August 7, 2010.