Y. M. Timofeyev, G. M. Nerobelov, A. V. Poberovskii, and N. N. Filippov. Determining Both Tropospheric and Stratospheric CO2 Contents Using a Ground-Based IR Spectroscopic Method. Izvestiya, Atmospheric and Oceanic Physics, Pleiades Publishing Ltd, volume 57, issue 3, pages 286-296, May 2021.