@article{Velinov:2016bS,
  author = "Velinov, Peter  and  Mishev, Alexander",
  title = "{Computation of ionization effect due to cosmic rays in polar middle atmosphere during GLE 70 on 13 December 2006 }",
  doi = "10.22323/1.236.0156",
  journal = "PoS",
  year = 2016,
  volume = "ICRC2015",
  pages = "156"
}