@article{Kobyakova2025trends, author={Kobyakova, S.E. and Gololobov, A.Y. and Karimov, R.R. and Stepanov, A.E.}, title={Trends in the F2-layer critical frequency from data obtained at the ionospheric station Yakutsk during the period from 1956 to 2017}, journal={Solnechno-Zemnaya Fizika}, publisher={Institute of Solar-Terrestrial Physics SB RAS}, year={2025}, pages={55-63}, volume={11}, issue={4}, }