Isoptics of a parabola
- Thierry Dana-Picard
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be learnt when changing the point of view on conic sections?, Aleh 38, 22-31.Th. Dana-Picard, G. Mann and N. Zehavi (2011): From conic intersections
to toric intersections: the case of the isoptic curves of an ellipse, The Montana Mathematical Enthusiast 9 (1), 59-76.