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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...