@unpublished{LiperovskyPochotelovLiperovskayaetal.2007,
  author  = {V.A. Liperovsky and O.A. Pochotelov and E.V. Liperovskaya and M. Parrot and C.-V. Meister and O. A. Alimov},
  title   = {Modifications of sporadic E-layers caused by seismic activity},
  institution = {Interdisziplin{\"a}res Zentrum f{\"u}r Dynamik komplexer Systeme},
  series    = {NLD Preprints},
  number    = {49},
  year    = {2007},
}