Geodesic
Principles of Thinking and Activities Theory Applied to a School Course of Geometry
Matematičeskoe obrazovanie, Tome 36 (2006) no. 1, pp. 69-79.

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

The mentioned theory demands to distinguish between sensitive and ideal fields of geometry and to form ideal objects of geometry while teaching. 
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A. Ustilovskaya. Principles of Thinking and Activities Theory Applied to a School Course of Geometry. Matematičeskoe obrazovanie, Tome 36 (2006) no. 1, pp. 69-79. http://geodesic.mathdoc.fr/item/MO_2006_36_1_a4/