Geodesic
Observations of the Sun, Mercury and Venus in Both coordinates, Made With the Large Meridian Circle of Belgrade Observatory
Publications of the Department of Astronomy, Tome 6 (1976) no. 1.

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

Visual observations of the Sun, Mercury and Venus in right ascension and declination, are carried out at the Belgrade Observatory by the Group for Relative Coordinates, since 1973. In the first two years the observations had but a preliminary character, whilst regular ones started in 1975. 
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     author = {S. Sad\v{z}akov and D. \v{S}aleti\'c and M. Da\v{c}i\'c},
     title = {Observations of the {Sun,} {Mercury} and {Venus} in {Both} coordinates, {Made} {With} the {Large} {Meridian} {Circle} of {Belgrade} {Observatory}},
     journal = {Publications of the Department of Astronomy},
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     year = {1976},
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S. Sadžakov; D. Šaletić; M. Dačić. Observations of the Sun, Mercury and Venus in Both coordinates, Made With the Large Meridian Circle of Belgrade Observatory. Publications of the Department of Astronomy, Tome 6 (1976) no. 1. http://geodesic.mathdoc.fr/item/PDA_1976_6_1_a19/