@article{Polyakov_2021, title={Measurements of CFC-11, CFC-12, and HCFC-22 total columns in the atmosphere at the St. Petersburg site in 2009–2019}, volume={14}, ISSN={1867-8548}, url={http://dx.doi.org/10.5194/amt-14-5349-2021}, DOI={10.5194/amt-14-5349-2021}, number={8}, journal={Atmospheric Measurement Techniques}, publisher={Copernicus GmbH}, author={Polyakov, Alexander and Poberovsky, Anatoly and Makarova, Maria and Virolainen, Yana and Timofeyev, Yuri and Nikulina, Anastasiia}, year={2021}, month=aug, pages={5349–5368} }