@article{LiperovskyPochotelovLiperovskayaetal.1998,
  author    = {Viktor A. Liperovsky and O. A. Pochotelov and E. V. Liperovskaya and M. Parrot and Claudia-Veronika Meister and O. A. Alimov},
  title     = {Modifications of sporadic E-layers caused by seismic activity},
  journal   = {Preprint NLD},
  volume    = {49},
  year      = {1998},
}