Астроида (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Астроида" in Russian language version.

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1books.google.com

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archive.org

Loria, Gino. Spezielle algebraische und transscendente ebene kurven. Theorie und Geschichte. — Leipzig, 1902. — P. 224.

books.google.com

J. J. v. Littrow. §99. Die Astrois // Kurze Anleitung zur gesammten Mathematik. — Wien, 1838. — P. 299.