High precision difference astrometry applied to the triplet of S5 radio sources B1803+784/Q1928+738/B2007+777

1. Ros, E.
2. Marcaide, J.M.
3. Guirado, J.C.
4. Ratner, M.I.
5. Shapiro, I.I.
6. Krichbaum, T.P.
7. Witzel, A.
8. Preston, R.A.