@unpublished{LiperovskayaMeisterParrotetal.2007,
  author  = {E. V. Liperovskaya and Claudia-Veronika Meister and M. Parrot and V. V. Bogdanov and N. E. Vasil'eva},
  title   = {On Es-spread effects in the ionosphere connected to earthquakes},
  institution = {Interdisziplin{\"a}res Zentrum f{\"u}r Dynamik komplexer Systeme},
  series    = {NLD Preprints},
  number    = {65},
  year    = {2007},
}