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@article{Hayakawa2021c,
  year = 2021,
  title = {{The Extreme Solar and Geomagnetic Storms on 21-27 March 1940}},
  journal = {Monthly Notices of the Royal Astronomical Society},
  author = {H. Hayakawa and D. M. Oliveira and M. A. Shea and D. F. Smart 
            and S. P. Blake and K. Hattori and A. T. Bhaskar 
            and J. J. Curto and D. R. Franco and Y. Ebihara},
  doi = {10.1093/mnras/stab3615}
}