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Лобачевский's Documents
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Лобачевский's Documents
Лобачевский's Documents
Геометрические исследования по теории парралелных линий
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Избранные труды по геометрии
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Избранные труды по геометрии
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Три сочинения по геометрии
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Избранные труды по геометрии
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