@article{Danilov2020a,
  author = "A. D. Danilov and A. V. Konstantinova",
  title = "Long-Term Variations in the Parameters of the Middle and Upper Atmosphere and Ionosphere (Review)",
  year =  2020 ,
  journal = "Geomagnetism and Aeronomy",
  volume = 60,
  pages = "397-420",
  keywords = "pfisr, sondre",
  doi = "10.1134/S0016793220040040"
}