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References to 'circle of curvature'
1. catenary by pahio
2. classical differential geometry by matte
3. curvature (plane curve) by rspuzio
4. differential geometry by rspuzio
5. evolute by pahio
6. evolute of cycloid by pahio
7. Meusnier's theorem by pahio
8. normal line by pahio
9. particle moving on the astroid at constant frequency by perucho
10. spiral motion of a particle by perucho