@article{Kravtsova2015spectra,
author={Kravtsova, M.V. and Sdobnov, V.E.},
title={Spectra of variations and cosmic ray anisotropy during GLE of June 11, 1991},
journal={Solnechno-Zemnaya Fizika},
publisher={INFRA-M Academic Publishing LLC.},
year={2015},
pages={115-120},
volume={1},
issue={1},
}