Tham khảo Cực_và_đường_thẳng_đối_cực

  • Durell, C. V. "Poles and Polars." Ch. 9 in Modern Geometry: The Straight Line and Circle. London: Macmillan, pp. 93–97, 1928.
  • Casey, J. "Theory of Poles and Polars, and Reciprocation." §6.7 in A Sequel to the First Six Books of the Elements of Euclid, Containing an Easy Introduction to Modern Geometry with Numerous Examples, 5th ed., rev. enl. Dublin: Hodges, Figgis, & Co., pp. 141–148, 1888.
  • Coxeter HSM, Greitzer SL (1967). Geometry Revisited. Washington: MAA. tr. 132–136, 150. ISBN 978-0-88385-619-2.
  • Dörrie, H. 100 Great Problems of Elementary Mathematics: Their History and Solutions. New York: Dover, p. 157, 1965.
  • Johnson, R. A. Modern Geometry: An Elementary Treatise on the Geometry of the Triangle and the Circle. Boston, MA: Houghton Mifflin, pp. 100–106, 1929.
  • Johnson RA (1960). Advanced Euclidean Geometry: An Elementary treatise on the geometry of the Triangle and the Circle. New York: Dover Publications. tr. 100–105.
  • Gray J J (2007). Worlds Out of Nothing: A Course in the history of Geometry in the 19th century. London: Springer Verlag. tr. 21. ISBN 978-1-84628-632-2.
  • Korn GA, Korn TM (1961). Mathematical Handbook for Scientists and Engineers. New York: McGraw-Hill. tr. 43–45. LCCN 59014456. The paperback version published by Dover Publications has the ISBN 978-0-486-41147-7.
  • Wells D (1991). The Penguin Dictionary of Curious and Interesting Geometry. New York: Penguin Books. tr. 190–191. ISBN 0-14-011813-6.

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WikiPedia: Cực_và_đường_thẳng_đối_cực http://www.ping.be/~ping1339/pole.htm http://mathworld.wolfram.com/InversionPole.html http://mathworld.wolfram.com/Polar.html http://mathworld.wolfram.com/ReciprocalCurve.html http://mathworld.wolfram.com/Reciprocation.html //lccn.loc.gov/59014456 http://www.cut-the-knot.org/Curriculum/Geometry/Po... http://www.geogebra.org/de/examples/polare/polare_... https://archive.org/details/geometryrevisite00coxe https://archive.org/details/geometryrevisite00coxe...