@article{Ivanov2016the,
author={Ivanov, G.. and Dmitrieva, I.M.},
title={The Duality Principle Is the Theoretical Basis of Interrelation of Synthetic and Analytical Methods of Solving Geometric Problems},
journal={Geometry & Graphics},
publisher={INFRA-M Academic Publishing LLC.},
year={2016},
pages={3-10},
volume={4},
issue={3},
}