Trudy 18-ĭ Astrometricheskoĭ konferent︠s︡sii SSSR, Pulkovo, 2-5 ii︠u︡ni︠a︡ 1969 g.

Russia (Federation)) Vsesoi︠u︡znai︠a︡ astrometricheskai︠a︡ konferent︠s︡ii︠a︡ SSSR (18th 1969 Pulkovo, Glavnai︠a︡ astronomicheskai︠a︡ observatorii︠a︡ (Soviet Union), M. S. Zverev