TY  - BOOK
AU  - Johnston, K. J., ed.
AU  - Kaplan, George H., ed.,
AU  - Luzum, Brain, ed.
AU  - McCarthy, Dennis D., ed.
ED  - International Astronomical Union
ED  - International Astronomical Union Colloquium
TI  - Towards models and constants for sub - microarcsecond astrometry: proceedings of 180th IAU colloquium held in Washington, D. C., U.S.A., March 27-30, 2000
T2  - IAU Colloquium; no.180
PY  - 2000///
CY  - Washington, D. C.
PB  - U. S. Naval Observatory
KW  - Astrometry
ER  -