@article{Borovik2020low-power,
author={Borovik, A.V. and Zhdanov, A.A.},
title={Low-power solar flares of optical and X-ray wavelengths for solar cycles 21–24},
journal={Solnechno-Zemnaya Fizika},
publisher={INFRA-M Academic Publishing LLC.},
year={2020},
pages={18-25},
volume={6},
issue={3},
}