@article{Grigoryev2020asymmetry,
author={Grigoryev, V.M. and Ermakova, L.V. and Khlystova, A.I.},
title={Asymmetry in occurrence of the leading and following polarities in the photospheric magnetic field at the early stage of active region formation},
journal={Solnechno-Zemnaya Fizika},
publisher={INFRA-M Academic Publishing LLC.},
year={2020},
pages={3-9},
volume={6},
issue={4},
}