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Press

 IT blog "Geektimes", article:
  "Electrostatic air cleaning rooms from radon decay products."
  https://geektimes.ru/post/271438/

 Technical conference "Party Hard! 2016" (video):
  "The electrostatic filter as a device to clean the air from radon decay products
  in the living and domestic buildings."
  https://www.youtube.com/watch?v=-OYraGZ7JeU

 Scientific Conference: "Chernobyl: 30 years later":
  "Applicability of electrostatic collection method for removal daughter decay products
  of radon and thoron from indoor air."
  http://rir.by/30y_conf.html, PDF file (page 317)