@article{Grigoryev2022appearance, author={Grigoryev, V.M. and Ermakova, L.V. and Khlystova, A.I.}, title={Appearance of active regions at the end of solar cycle 24 and at the beginning of cycle 25}, journal={Solar-Terrestrial Physics}, publisher={INFRA-M Academic Publishing LLC.}, year={2022}, pages={28-35}, volume={8}, issue={4}, }