@article{Aristarhova2021collective,
author={Aristarhova, O.Y. and Dvoryankina, Y.V. and Osipova, E.A. and Lebedincev, V.B.},
title={Collective Classes in a Group of Different Ages Based on the Integration of the Content of Different Academic Subjects},
journal={Primary Education},
publisher={INFRA-M Academic Publishing LLC.},
year={2021},
pages={30-36},
volume={9},
issue={5},
}