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