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Theorema Theorema egregium The Remains of the Day Theone margelanicaTài liệu tham khảo
WikiPedia: Theorema egregium https://www.wired.com/2014/09/curvature-and-streng... https://archive.org/details/cu31924001557226 https://archive.org/details/disquisitionesg00gausg...