Reference systems : proceedings of the 127th Colloquium of the International Astronomical Union held in Virginia Beach, VA, USA, 14-20 October 1990 /
International Astronomical Union.Colloquium(127th :1990 :Virginia Beach, Va.)
Hughes, James A.
Smith, Clayton A.
Kaplan, George H.
Washington, D.C. : United States Naval Observatory,
1991.
Includes bibliographical references.
Celestial reference systems