@article{Ulyanova2017the,
author={Ulyanova, I.V.},
title={The Core of the Activity Concept of Extend Didactic Unit (EDU) Technology in Teaching Geometry},
journal={Scientific Research and Development. Socio-Humanitarian Research and Technology},
publisher={INFRA-M Academic Publishing LLC.},
year={2017},
pages={71-76},
volume={6},
issue={1},
}