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Y-32 2	Yatskiv, Ya. S.     IAU Sympozium №78 "Nutation and the Earth's Rotation" (held in Kiev, May 1977) as first step in the consideration concerning the Non-rigid Earth Nutation Theory [Текст] / National Academy of Sciences of Ukraine. Main Astronomical Observatory. — Kyiv : [б. и.], 2007. — 23 p.