@article{DAN_1993_333_1_a8,
     author = {G. V. Givishvili and L. N. Leshchenko},
     title = {Long-term trends of the mid-latitude ionosphere and thermosphere properties},
     journal = {Doklady Akademii Nauk},
     pages = {86--89},
     publisher = {mathdoc},
     volume = {333},
     number = {1},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_333_1_a8/}
}