@article{Dmitrieva2018competence,
author={Dmitrieva, I.M. and Ivanov, G.S.},
title={Competence Approach in Teaching the Topic "Tangent Plane and Normal"},
journal={Geometry & Graphics},
publisher={INFRA-M Academic Publishing LLC.},
year={2018},
pages={47-54},
volume={6},
issue={4},
}