In mathematics, the Wirtinger plane sextic curve, studied by Wirtinger, is a degree 6 genus 4 plane curve with double points at the 6 vertices of a complete quadrilateral.

• Coble, Arthur B. (1929), Algebraic geometry and theta functions, American Mathematical Society Colloquium Publications, vol. 10, Providence, R.I.: American Mathematical Society, ISBN 978-0-8218-1010-1, MR 0733252
• Dolgachev, Igor. (2012), Classical Algebraic Geometry:a modern view, Cambridge.: Cambridge University Press, ISBN 978-1-107-01765-8, MR 2964027

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