@article{Keldibekova2019olympiad,
author={Keldibekova, A.O. and Selivanova, N.S.},
title={Olympiad tasks on geometry, methodical techniques for their solution},
journal={Profession-Oriented School},
publisher={INFRA-M Academic Publishing LLC.},
year={2019},
pages={34-37},
volume={7},
issue={4},
}