*G M R Winkler and T C van Flandern (1977), "Ephemeris Time, relativity, and the problem of uniform time in astronomy", "Astronomical Journal", vol.82 (Jan. 1977), pp.
* G M R Winkler and T C van Flandern (1977), «Ephemeris Time, relativity, and the problem of uniform time in astronomy», "Astronomical Journal", vol.82 (Jan. 1977), pp.