Geodesic
On a certain method of constructing an ellipsis
Matematičeskoe obrazovanie, Tome 80 (2016) no. 4, pp. 42-47.

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

If the vertices the fixed length of the segment slide on the sides of the angle, its middle It describes an arc of some ellipse. Based on this fact, a method of constructing ellipse defined by the equation in the Cartesian coordinate system.
Keywords: Chord, moving from side to side angle locus of midpoints of chords. 
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     author = {E. G. Smoljanova},
     title = {On a certain method of constructing an ellipsis},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {42--47},
     publisher = {mathdoc},
     volume = {80},
     number = {4},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2016_80_4_a3/}
}
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E. G. Smoljanova. On a certain method of constructing an ellipsis. Matematičeskoe obrazovanie, Tome 80 (2016) no. 4, pp. 42-47. http://geodesic.mathdoc.fr/item/MO_2016_80_4_a3/