Geodesic
What is a Curve of Order 2?
Matematičeskoe obrazovanie, Tome 25 (2003) no. 2, pp. 67-79.

Voir la notice de l'article provenant de la source Math-Net.Ru

The theory of curves of order 2 is presented in an elementary way for High School students of age 15–16. 
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S. V. Dvoryaninov. What is a Curve of Order 2?. Matematičeskoe obrazovanie, Tome 25 (2003) no. 2, pp. 67-79. http://geodesic.mathdoc.fr/item/MO_2003_25_2_a5/