The Federalism Idea as a Paradigm of Historical Perspective of Ukrainian Revolution Age in 1917–1921 von H. O. Korolov

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Slavic Federation and "Free Union", or Ukrainian Debates on Federalism in the "Long XIX Century" von H. O. Korolov

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Conservative Utopia of V.Kuchabs'kyi: "Geopolitical Triangle", Revolution and Eastern Europe von H. O. Korolov

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The Opinion of Mykhailo Hrushevs'kyi about Black Sea Federation Idea von H. O. Korolov

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