The Precious Set of Radio-optical Reference Frame Objects in the Light of Gaia DR2 Data
Journal article published in 2019 by
Valeri V. Makarov 
,
Ciprian T. Berghea ,
Julien Frouard ,
Alan Fey,
Henrique R. Schmitt
,
Ciprian T. Berghea ,
Julien Frouard ,
Alan Fey,
Henrique R. Schmitt
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