@article{DAN_1984_279_2_a16,
     author = {G. S. Ivanov-Kholodnyi and Yu. K. Kalinin},
     title = {Geophysical invariance of the ionospheric $\mathrm{F}$ region as a},
     journal = {Doklady Akademii Nauk},
     pages = {332--334},
     year = {1984},
     volume = {279},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_279_2_a16/}
}