Figure Eight Curve - MacTutor History of Mathematics

Deltoid curve - Wikipedia

Figure Eight Curve - MacTutor History of Mathematics

The Educational Times Database: Building an Online Database of Mathematics Questions and Solutions Published in a 19th-Century Journal

Editorial, April 2018 - IMA

Deltoid curve - Wikipedia

Envelopes and Offsets of Two Algebraic Plane Curves: Exploration of Their Similarities and Differences

Eight Curve -- from Wolfram MathWorld

Watt's Curve - MacTutor History of Mathematics

Fluid Mathematics – Bhāvanā

cdn./82/26982-004-92145859/differenc

Full article: Still Spinning: The Moser Spindle at Sixty

Graph Labelings: A Prime Area to Explore

Wassenaar J.) 2D Curves, PDF, Circle