Geodesic
What is a Curve of Order 2?
Matematičeskoe obrazovanie, no. 2 (2003), pp. 67-79 
S. V. Dvoryaninov. What is a Curve of Order 2?. Matematičeskoe obrazovanie, no. 2 (2003), pp. 67-79. http://geodesic.mathdoc.fr/item/MO_2003_2_a5/
@article{MO_2003_2_a5,
     author = {S. V. Dvoryaninov},
     title = {What is a {Curve} of {Order} 2?},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {67--79},
     year = {2003},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2003_2_a5/}
}
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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.