Salmon, G. A treatise on conic sections : containing an account of some of the most important modern and algebraic and geometric methods / by George Salmon; G. Salmon .— 6 edition .— : Longmans Green and co., 1879 .— 439 с. — Lang: eng .— URL: https://rucont.ru/efd/92940 (дата обращения: 16.11.2025)