Howison, G.H. A treatise on analytic geometry, especially as applied to the properties of conics / By George H. Howison; G.H. Howison .— : Wilson Kinkle [etc.], 1869 .— 610 с. — Lang: eng .— URL: https://rucont.ru/efd/83861 (дата обращения: 06.08.2024)