The Soviet Union recently released Leonid Plyushch, the Ukrainian mathematician held for over three years in Dnepropetrovsk penal mental hospital. Vera Rich reports
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Rich, V. USSR: Plyushch says protest. Nature 259, 520 (1976). https://doi.org/10.1038/259520a0
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DOI: https://doi.org/10.1038/259520a0