“..., the corrections to the position of the celestial pole given by the IAR 1976/1980 models are simultaneously...”

“... and IAU 1980 Theory of Nutation in the analysis of VLBI observations would give rise to systematic errors...”

“... models IAU 1976 of the precession and IAU 1980 of the nutation. The astrometric comparison...”

“... varios trabajos entre los que cabe mencionarse los de Arias (1982) y Mondinalli et al. (1980 y 1985). En...”