@phdthesis{PopovLiperovskyMeisteretal.1996,
  author    = {Popov, K. V. and Liperovsky, Viktor A. and Meister, Claudia-Veronika and Liperovskaya, E. V.},
  title     = {Anthropogenic effects with weekly periodicity in the F-region ionosphere},
  year      = {1996},
  language  = {en}
}